With the rapid development of the economy, people's various needs for daily life are also increasing. Because this sport combines sports and dance, which makes the sport have the effect of physical fitness, as well as the emotional edification and visual beauty that dance brings to dancers and audiences. With the increase in people's needs, at the same time, corresponding to the relatively insufficient functional training of the project, this problem makes sports dance, the international standard ballroom dance, always at a low level of development, and at the same time, makes it lack of competitiveness. Also, the nature of dance is now more of a viewing experience. In view of the lack of functional training in international standard ballroom dancing, this article will study the role of functional training in this. By adopting the technology of human body feature recognition and functional action screening, it implements the steps of human action recognition detection technology, human action tracking technology, human body posture shape recognition method, and functional action screening. And the final experimental results show that functional training can screen out 57.3% of female dancers, with ligament damage, and 52.1% of male dancers. The screen outs were more than half of the total numbers, which shows that functional training effectively improves international standard ballroom dance that can provide good assistance for dancers' training.