Modern educational theory shows that emotion is an important factor that directly affects the quality of education and teaching. The latest scientific research shows that the factor that really affects a person's wisdom and determines whether a person can succeed is not IQ, but positive emotion. People who are good at adjusting their emotions are bound to have more chances of success, so it is easier to make impressive achievements. In physical education teaching in primary schools, teachers should pay attention to cultivating students' positive emotions, stimulate students' enthusiasm for participating in physical education class through teachers' cordial explanations, vivid demonstrations and fascinating inspiration, and improve their sense of identity with physical education and other disciplines. A teacher who doesn't love his students can't be an excellent teacher. Teachers' deep concern and ardent expectation for students in teaching will stimulate students' great internal potential, give them endless motivation and inspire their spirit of hard training and tenacious struggle. Pupils, in particular, are psychologically fragile and sensitive to external reactions. Teachers should warm students with kind language, kind expression and gentle eyes in teaching. Only in this way can students truly love sports and exercise and truly regard physical education class as a place to seek happiness. Of course, there is no contradiction between caring for and demanding students. They complement each other. Teachers should not only love students, enter their hearts, trust and respect students, but also strictly demand students to grow up along the right path and never give in to their mistakes. Pay attention to cultivating students' feelings for sports at ordinary times. Only when students form positive feelings about sports can they devote themselves to sports and have a strong interest in sports. In physical education teaching, teachers are committed to the unity of science and ideology, and strive to create a harmonious and happy physical education class so that students can enjoy the fun in physical exercise. Only in this atmosphere can teachers teach comfortably and students learn comfortably. Therefore, teachers must make efforts to explore and deeply study textbooks, fully tap the emotional factors of textbooks, capture the positive emotional factors in students' learning process, and seize the opportunity to carry out emotional education for students. For example, telling students the benefits of sports from an early age can not only strengthen their health, but also win glory for the country, thus stimulating students' enthusiasm for learning sports and their goodwill towards sports. For another example, in teaching, teachers' demonstration and guidance can be used to cultivate students' determination to be rigorous, practical, not afraid of hardship and strive to achieve good results. Creating a harmonious teaching atmosphere, a healthy and harmonious relationship between teachers and students, and a relaxed and happy classroom are very important for the formation of students' good feelings. Students' interest will be generated in such an atmosphere. No matter teaching or physical training, bad emotions will affect the completion of movements and even lead to students' injury accidents. At this time, teachers must patiently point out students' problems, patiently help them analyze the reasons, rationally solve the problems, demonstrate the correct actions for students, guide and encourage them to concentrate and complete the actions with confidence. If teachers look on coldly, or turn a blind eye to students, or even cynically, it will inevitably damage students' self-esteem, trigger students' strong resistance, and make them gradually lose confidence in sports, thus hating sports and avoiding sports. Therefore, teachers should care and understand students, especially those with poor physical fitness and weak sports coordination ability, and encourage and demonstrate more. In this way, students will feel that physical education class is full of flavor and happiness. I think we can start from the following aspects to build a harmonious and happy physical education class: teachers should adjust their emotions before class and present an optimistic and sunny image to students, and teachers will also encounter some unsatisfactory things in their work and life. If bad emotions are brought into the classroom, it will definitely affect teaching and cast a shadow over the classroom. Therefore, before class, teachers should first check their emotions, and when they find bad emotions, they should rationally overcome them and adjust them in time to bring positive and healthy emotions to students. Choosing a beautiful and clean venue, a beautiful and clean activity venue, can give people a good feeling and make people feel happy, thus enhancing their desire for training and exploration. Demonstration movements should be accurate, smooth, accurate and smooth. Demonstration actions can give people a beautiful feeling and naturally guide students to follow suit. For example, teaching aerobics and rhythmic gymnastics. Teachers should not only have healthy beauty, dynamic beauty, but also rhythmic beauty when demonstrating, so that people can feel the endless rhythm of life in dynamic music. Through the teacher's demonstration and demonstration, students' interest will be greatly improved and their thirst for knowledge will be stimulated. It plays an important role in the formation of students' correct behavior to infect students and teachers with beautiful and pleasant language and give appropriate explanations. Therefore, teachers should use beautiful and pleasant language to properly decompose the essentials of movements, so that students can understand the connotation of sports in listening. Of course, when the teacher explains, in addition to explaining the essentials of movements, he can also introduce some fitness knowledge according to the age and preferences of the students. In this process, the tone should be cordial and pleasant, and the language should be humorous and cadence, so that students can realize the teacher's concern for themselves and have a strong interest in physical education class. Teachers should give students at different levels the opportunity to feel successful, so that every student can feel the joy of success. In any class, students' physical quality, training ability and acceptance ability are different. Teachers should respect students' individual differences and design corresponding training contents according to students' actual situation, so that students can get exercise without bearing greater psychological pressure. Teachers should give full affirmation and praise to students' achievements; When students' movements are not in place or successful, teachers should kindly point out the problems and encourage them to enhance their confidence and courage to overcome difficulties. In primary school physical education teaching, teachers should devote themselves to making students feel the affection of family, the infiltration of love and beautiful experience, so that students can improve their grades in happiness, feel inadequate in their efforts, and constantly enhance their confidence and make progress in the deep expectations of teachers.