-as the technology develops, the mechanical-electrical integrated exercise equipment has been paid attentions to by more and more sports enthusiasts. In the swimming exercise, highquality training equipment can speed up the training progress, enhance and consolidate swimming skills, improve the strength training of the core muscles and strengthen the special quality of swimming. Currently, foreign core strength training equipment has many advantages because it adopts isokinetic equipment mode of exercise training which can completely simulate the underwater sports environment and realize real-time monitoring of training data while domestic one has deficiencies of imperfect mechanical structure design and unstable mechanical friction plus resistance output. On the basis of fully understanding the core muscle group and the core strength training theory, this paper carries out the design and research of swimming practice equipment. Through the absorption of foreign excellent experience, good core muscle training effect was achieved.