The invention relates to a neural network control method for an ultrasonic motor servo control system. An ultrasonic motor servo control system is provide, comprises a base and an ultrasonic motor arranged on the base, An output shaft of one side of the ultrasonic motor is connected with a photoelectric encoder, an output shaft of the other side of the ultrasonic motor is connected with an inertiaload of a flywheel, the output shaft of the inertia load of the flywheel is connected with a torque sensor through a coupling, and a signal output end of the photoelectric encoder and a signal outputend of the torque sensor are respectively connected with a control system; This method is based on neural network, which not only reduces the tracking dynamic error, but also minimizes the hysteresisloop of servo system, so that better input and output control efficiency can be obtained. The method of the invention not only has high control accuracy, but also has simple structure, compact structure and good use effect.