The invention discloses a high-efficiency permanent magnetic driver with fixed air gaps. The driver comprises a permanent magnetic transmission shaft, a conductor transmission shaft, an adjusting actuator and a permanent magnetic rotation disc; the permanent magnetic transmission shaft and a connection cylinder are connected with the permanent magnet rotation disc through a bearing disc; the permanent magnet rotation disc comprises a permanent magnet, an inner fixing ring, a permanent magnet carrier and an outer fixing ring; both ends of the permanent magnet carrier are respectively mounted on the outer wall of the inner fixing ring and the inner wall of the outer fixing ring; the permanent magnet is arranged in the permanent magnet carrier; a first conductor rotation disc and a second conductor rotation disc are arranged on the conductor transmission shaft in a sheathing manner; a conductor ring and a heat dissipation ring are respectively mounted on each of the first conductor rotation disc and the second conductor rotation disc; the adjustment actuator is mounted on the receiving disc; the adjusting actuator is connected with the permanent magnet carrier through a lever transmission structure which is arranged in the wall of the connection cylinder. The driver can adjust the rotation speed of a load by adjusting the direction of a magnetic pole of the permanent magnet, so that the zero load starting can be realized, the loss of a motor is reduced, and the heat dissipation speed is high.