The invention discloses a motor with a cooling system. The motor comprises a casing. The casing is provided therein with a rotor and a stator. The rotor comprises a rotor shaft. The rotor shaft is provided therein with a rotor shaft axial hole for air circulation. The outer sidewall of the rotor shaft is provided with rotor shaft radial hole communicating with the rotor shaft axial hole. The rotorshaft radial hole and the rotor shaft axial hole form a rotor cooling flow passage. A stator cooling flow passage is arranged between the casing and the stator. The motor can cool the inside of the rotor through the rotor shaft axial hole and the rotor shaft radial hole. The stator cooling flow passage can cool the stator. The rotor and the stator can be cooled simultaneously by air without additional medium, thereby improving the heat resistance level of the motor and ensure the long-term and stable operation of the motor.