Aiming at the direct starting problem of three-phase asynchronous motor for hoisting equipment, the T type equivalent circuit of asynchronous motor was analyzed. The working principle of thyristor voltage regulating circuit was expounded. A soft start method of asynchronous motor based on trigger angle timing control was proposed. The corresponding system simulation model was built based on MATLAB/Simulink. Simulation analysis of the proposed method was carried out, and the correctness of the proposed method was verified. The software and hardware of the corresponding soft starter were designed based on single chip microcomputer. Test tests were carried out. The results show that the proposed method can effectively realize the smooth starting of three-phase asynchronous motor, and the starting current is small, which can effectively reduce the influence of starting process on the motor and the power grid.