With the deep integration of modern information technology and auxiliary training, virtual reality technology represented by human-computer interaction has gradually received widespread attention. In this paper, virtual reality technology is applied to the physical fitness training of college engineering students to assist teaching, so that learners in the virtual sports situation with the help of VR sensing equipment to complete a variety of sensory real-time interaction, combined with the goal of stimulating feedback mechanism to improve students' self-efficacy and interest in learning, and use practice to explore the teaching effect and potential value of the achieved not only to promote the diversified development of sports skills learning, but also to provide a reference for the application of virtual reality technology in sports. It can not only promote the diversified development of motor skills learning, but also provide reference for the application of virtual reality technology in sports. The application of virtual reality technology in the physical fitness training and teaching of college engineering students can be used as a means to stimulate the effect of the potential learning ability of the learners, in the awakening of interest in the sports situation at the same time to promote the improvement of sports skills, while the traditional classroom learners in the emotional attitude did not have a positive effect on the promotion. Secondly, it is difficult to form an effective stimulating effect in physical quality by different teaching methods. The experimental results show that the application of using virtual reality technology to optimise engineering students' physical fitness training is significant and proves the effectiveness of the proposed method.