The high-power permanent magnet brushless DC motor, and the motor comprises a rotor, a stator, a housing sleeving the exterior of the stator, and a rear end cover. A radial air gap is formed between the rotor and the stator, and the rotor comprises a hollow rotating shaft and a magnetic steel arranged on the rotating shaft in a sleeving mode. The magnetic steel comprises two magnetic poles, and the magnetic poles are arranged on the periphery of the rotating shaft in the circumferential direction according to N-S. The stator comprises a stator core and windings arranged at the two ends of thestator core, and the stator core comprises a group of laminated stator punching sheets, and six tooth grooves which are uniformly distributed in the circumferential direction are formed in the inner rings of the stator punching sheets. The permanent magnet brushless DC motor disclosed by the invention adopts integer slot matching and magnetic pull force symmetry, so that the motor operates stably,and the radiating ribs and the air duct are arranged, so that the long-term reliable operation of the motor is ensured.