The invention discloses a rotate speed tracking and restarting method for a high voltage frequency converter, and provides a rotate speed tracking and restarting method integrated with remanent magnetism voltage detection and torque current measurement, taking the length of the power-off duration as the criteria for detecting different electrical quantities. The rotate speed tracking and restarting method for a high voltage frequency converter includes the steps: when the power-off duration is short, utilizing a tracking method for detecting the remanent magnetism voltage of a stator; when the power-off duration is long, utilizing a tracking method based on the torque current; applying the test voltage at the stator side, taking a stator voltage vector to perform orientation, and measuring the torque component of the stator current until the torque component is close to zero while the synchronous rotate speed corresponding to the test voltage frequency is the rotate speed of a rotor; and finally, being the restarting phase, ordering the voltage frequency ratio to rise step by step and then ordering the upgraded voltage frequency ratio to recover to a normal voltage frequency ratio and to boost to a target value. The rotate speed tracking and restarting method for a high voltage frequency converter has no requirement for adding extra hardware devices, and can track any rotate speeds of an auxiliary engine, and is high in reliability and is simple in setting.