Children's English online training institutions have been favored by parents since their appearance. They highly combine English education with the Internet, so that children can enjoy educational resources from all over the world without leaving home. According to the survey, there are three reasons why parents prefer online training institutions for children's English: first, professional foreign teachers are easy to obtain; Children's English online training institutions provide professional foreign teachers for our children, such as cheap Filipino foreign teachers and professional pure British, American and Canadian foreign teachers to meet the needs of different parents. Compared with Chinese teaching, the biggest advantage of foreign teachers is that they can effectively improve children's listening and speaking ability in a relaxed way and let children express themselves skillfully and flexibly in English. For professional and pure foreign teachers from Britain, the United States and Canada hired by training institutions, children can use English flexibly and truly with more scientific and advanced teaching methods on the basis of ensuring pronunciation standards and pure thinking. At the same time, their deep understanding of the cultural customs behind English will help children better understand and use English. Children learn from foreign teachers in Britain, the United States and Canada, which not only improves their English level, but also improves their comprehensive quality and international vision. Secondly, practicality is the main content and goal of teaching; Different from the traditional teaching purpose, online English training for children is to make our children use English skillfully and flexibly, get rid of dumb and Chinglish completely and enhance their core competitiveness. Take training institutions as an example. After long-term teaching, children can not only communicate with others skillfully in English, but also take English as their own study and think and solve problems with English thinking, which is difficult for exam-oriented education. Third, it is convenient and cost-effective; In addition to the advantages in teaching, online training institutions for children's English have greatly reduced the burden on parents. First of all, staying at home will save a lot of time and cost; Secondly, a single class like a training institution is about 60-90 yuan, and an institution with a full refund system can reduce the economic cost of parents.