The invention relates to a method for measuring the inductance parameter of a permanent magnet synchronous motor, and belongs to the technical field of motor drive control. The problem of measured deviation accumulation caused by inaccurate mechanical locating of an axis d and an integral algorithm and inaccurate inductance parameter measurement caused by a dead zone and breakover drop voltages is solved. The method comprises the steps that at preset temperature, three-phase open circuit operation is carried out on the permanent magnet synchronous motor, the motor is driven to preset rotating speed through a dragging unit, counter electromotive force, permanent magnet flux linkage and stator resistance are measured, then three-phase short circuit operation is carried out, the physical characteristic that the rectangular axis voltage is zero is utilized, rectangular axis inductance is calculated through a rectangular axis voltage equation and a torque formula, the three-phase open circuit operation is carried out again, the counter electromotive force is measured, and whether rotor temperature is within an acceptable range or not is judged by measuring the changes of the front counter electromotive force and the rear counter electromotive force. According to the method, current waveform distortion caused by the dead zone of an inverter and the breakover drop voltages can be eliminated, d-axis mechanical locating is not needed, few mechanical devices are needed, and implementation is easy.