The invention provides a method for measuring the temperature of a permanent-magnet synchronous motor of a hybrid electric vehicle, two groups of temperature sensors A and B are embedded at the ends of three phase windings of the permanent-magnet synchronous motor by the method, wherein the group A comprises three sensors in parallel and is used for measuring the temperature of each phase winding; the group B comprises three sensors in series and is used for measuring the temperature change rate; and the signals of the two groups of temperature sensors are processed through the controller of the motor and then respectively fed back to the controller of the integral vehicle through CAN (Controller Area Network) communication. When either of two feedback values reaches a malfunction set value of the integral vehicle, the over-temperature malfunction of the motor is reported through the CAN communication, and the controller of the integral vehicle controls the motor to cut off high-voltage electricity in time, thereby protecting the motor. The method provided by the invention has the advantages of reasonable arrangement of the temperature sensors and multiple-type temperature measurement, can accurately monitor the temperature of the motor in time, and effectively diagnoses and processes the overheat malfunction of the motor, thereby enhancing the safety of the motor and the malfunction diagnosis capability of the integral vehicle.