According to the mathematical model of the rotor synchronous rotation dc-qc-0 coordinate system of asynchronous motor, the simulation model of asynchronous motor based on the S function in the MATLAB SIMU LINK toolbox is derived, and the starting process of asynchronous motor is simulated. For asynchronous motors, based on the dynamic model under dc-qc-0 coordinate system, the stator and rotor currents are used as state variables, and the S function in MATLAB is used to solve the differential equation. The simulation results of the asynchronous motor verify the correctness of the model. This method is convenient in construction, good in real-time, highly portable, and highly extensible.