The invention discloses a motor device manufacturing method. The method includes that motor input power, rotating inertia and motor rotor size are balanced, so that sufficient rotating moment output is guaranteed, and the motor input power, the rotating inertia and the motor rotor size are reduced as much as possible to meet requirements of a loading system. In addition, a motor rotor manufactured by the method is of a hollow structure, so that therotating inertia is lowered, bandwidth of the system is increased, and motor size is reduced. Therefore, a motor manufactured by the method is simple in integral structure and has the advantages of high reliability, high stability, high accuracy, high power density and high frequency response.