The invention discloses a magnetic suspension control moment gyro device. The magnetic suspension control moment gyro device is formed by a flywheel system and a frame system. The flywheel system is formed by fly hammers, radial magnetic suspension bearings, radial position sensors, axial driven magnetic suspension bearings, motors, a protective bearing, a sealing shell, an axle seat and the like. The protective bearing is located in the middle of a flywheel, the sealing shell and the axel seat are located on the two sides of the flywheel, and the fly hammers, the radial magnetic suspension bearings, the radial position sensors, the axial driven magnetic suspension bearings and the motors are sequentially arranged on the upper side and the lower side of the protective bearing from inside to outside. The frame system is formed by a support, a rotary disc, a torque motor, a bearing, a sleeve, a lock nut, a conductive slip ring, a photoelectric encoder, an end cap and a base. In the frame system, the support is connected with the axel seat and the rotary disc, the conductive slip ring is located in the middle of the rotary disc, and the sleeve, the bearing, the locking nut, the photoelectric encoder and the end cap are outwards located on the rotary disc. According to the magnetic suspension control moment gyro device, the axial driven magnetic suspension bearings and the photoelectric encoder are adopted, the size, the weight and vibration are reduced, control precision is improved, and the response speed is increased.