The invention provides a method, device, controller and system for reducing vibration and noise of a motor. The method comprises the steps that a current operating parameter of the motor is obtained; the value of amplitude and the phase angle of a harmonic current corresponding to the current operating parameter are determined according to a corresponding relation of a preset operating parameter and the value of amplitude and the phase angle of the harmonic current; the harmonic current corresponding to the current operating parameter is introduced into the motor so as to reduce the vibration and noise of the motor. Due to the fact that the corresponding relation of the operating parameter and the value of amplitude and the phase angle of the harmonic current is preset, in the motor operating process, only the current operating parameter of the motor needs to be obtained, the value of amplitude and the phase angle of the harmonic current corresponding to the current operating parameter are obtained according to the corresponding relation, and the harmonic current corresponding to the current operating parameter is directly introduced into the motor. The method is easy to implement and feasible, the response speed is high, a delay does not exist, and the realtime performance is good.