Optimizing teaching methods has always been the direction of exploration for physical education workers. With the development of technology, visualization devices have become more convenient and portable. By using technology reasonably, the quality of physical education classroom teaching can be improved, and students can learn sports movements from multiple dimensions, angles, and perspectives. This study captured and produced the details of the movements in breaststroke teaching. Through comparative experiments with teaching classes in the classroom, it was found that visual teaching intervention can better help students master the essentials of movements during the land imitation practice stage, and the intervention effect during the water practice stage varies from person to person; The combination of online and offline visual teaching interventions will better adapt to the current situation of swimming classrooms and improve the effectiveness of breaststroke teaching.