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In this study, taking the advantage of ultrasonic motors, a locking device driven by ultrasonic motor for magnetic bearing flywheel has been manufacture and evaluated. A locking device is used to eliminate the gap between the rotor and the stator of magnetic bearing flywheel in order to prevent it from shock and vibration. Since the present locking devices driven by initiating explosive device or magnetic motor have the disadvantages such as high, shock, large size, and heavy weight. The system of locking device includes mechanical structure and motion control. The driving component of mechanical structure applies a traveling rotary wave ultrasonic motor (TRUM). The transmission employs worm gear so as to drive the executive body. Then the flywheel is protected. The power input of the ultrasonic motor is stable and the temperature rise of ultrasonic motor is 4°C. The force of actuated clutch is 17.1 N along with the radial. So the locking device has a highly-efficient locking performance.