The invention discloses a method used for multi-motor synchronous control. The method is characterized in that a setting operation is implemented by adopting a synchronous setting way before a speed controller is put into operation; and after the speed controller is put into operation, a signal superposition operation for a compensation control signal output by the speed controller and a main control signal output by a main controller is carried out to obtain a driving signal used for controlling the motors. The method has the beneficial effects that the method used for multi-motor synchronous control is provided; and by adoption of the method, the multi-motor synchronous precision in dynamic operations can be improved, so that the operational stability of the multi-motor control system is improved consequently.