With the advent of 5G networks, the immersive classroom teaching reform based on virtual reality technology is the essence of classroom teaching reform in colleges and universities in the future. In the traditional classroom teaching, teachers mainly explain the knowledge points and gives some examples to the students. However, as the current technology development is very rapid, it is difficult for the previous teaching to achieve a good effect on the students. The students are bored with the annoying traditional learning methods, so it is hard for them to make progress. This requires teachers to change the classroom teaching. How to use the immersive course teaching based on virtual reality technology in 5G networks to improve students' learning interest and the efficiency of classroom teaching are very important. This paper conducts the application and research of immersive classroom teaching based on virtual reality technology in 5G network, constructs an immersive teaching design model based on virtual reality technology, and performs immersive teaching based on virtual reality technology.