The invention discloses an air pumping/supplying device and a control method thereof, wherein, the control method calculates the current target value of the DC bus bar through the target air volume and the actual air volume of the air extraction/supply equipment, adjusts the actual value of the DC bus bar current through the current target value of the DC bus bar, and adjusts the motor of the airextraction/supply equipment so as to make the actual air volume approach to the target air volume. Adjusting the output of the motor with the actual air volume and the target air volume can stably guarantee the actual air volume of the equipment, keep the constant air volume of the equipment, and reduce the influence of the running state, the running environment and the performance of the equipment on the use effect.