The poor nutritional status of college students is mainly manifested in unreasonable diet structure, unhealthy lifestyle, great psychological pressure and lack of nutritional knowledge and awareness. First of all, the unreasonable diet structure is an important cause of malnutrition, including partial eclipse, eating too many snacks, and lacking a balanced diet structure. Secondly, modern college students generally have unhealthy lifestyles, such as staying up late for a long time, lacking exercise, and relying on takeout. These bad living habits also affect their nutritional status. In addition, college students face multiple psychological pressures such as academic pressure, interpersonal pressure and employment pressure, which leads to emotional instability and loss of appetite, which in turn affects their diet. In addition, the lack of nutrition knowledge and awareness is also one of the factors of malnutrition among college students. They lack understanding of nutritional needs and correct dietary concepts and choices. Therefore, college students should pay attention to a reasonable diet structure and a healthy lifestyle, and at the same time improve their nutrition knowledge and awareness in order to maintain a good nutritional state.