The invention relates to a novel approaching sliding mode control method for a permanent magnet synchronous motor, belonging to the field of motor control. The method comprises a step of inputting a speed deviation between a motor speed set value and a motor speed into a sliding mode variable structure controller and outputting a q-axis current set value, a step of collecting three-phase alternating current and obtaining d-axis current and q-axis current through coordinate system conversion, a step of obtaining d-axis voltage and q-axis voltage by conversion and regulating a three-phase inverter by a switching signal obtained by voltage space vector pulse width modulation, and a step of finally, controlling the motor by using the output amount of a three-phase inverter. The sliding mode variable structure controller designed based on the novel approaching law in the invention can improve the dynamic quality of a controlled system, the controller has faster response speed and smaller overshoot, and the robustness and rapidity of the system are improved.