Parallel robot has the advantages of high rigidity, fast speed, strong flexibility and light weight, and it constitutes an important part of industrial robots together with serial robots. It is most widely used in food, medicine, electronics and other light industries, and has unparalleled advantages in material handling, packaging, sorting and so on. In the past two years, with the increasing application of parallel robots in the market, it has become a new force in the growth of industrial robot demand.