In order to solve the problem that multi-motor synchronization control can not meet high precision control and proportional synchronization control, an improved deviation coupling control structure system is proposed. According to the running state of each motor, speed compensation is carried out, and fixed gain is replaced by fuzzy PID controller. Combining with the structure principle of speed compensation module, the speed controller is improved. The control simulation model of permanent magnet synchronous motor is established, and the improved deviation coupling control of three motors is simulated and analyzed. The simulation results show that compared with the traditional fixed gain control strategy, the adaptive fuzzy PID control strategy of the improved control system has higher synchronization stability.