The invention provides a method for improving noise of double wind wheel resonance, comprising air supply equipment or radiating equipment with two wind wheels, wherein each wind wheel is electrically connected with a motor; and the impeller frequency difference of the two wind wheels in actual rotation is more than or equal to 4Hz by changing the load endured by one of the wind wheels, so that low-frequency resonance noise is reduced or eliminated. When the actually endured load of the wind wheels is changed, environmental air meets with resistance changes when entering, which equals to thatthe air-out working static pressure of the wind wheels is changed, the working dynamics of the wind wheels is changed simultaneously, and the working load of the motor is changed, so that the rotating speed of the wind wheel which endures larger load actually is changed, the rotating speed of the wind wheel with larger load is changed, and the rotating speed of the wind wheel with smaller load ismaintained. The method has the characteristics of simple and reasonable structure and flexible operation, and achieves the aim of reducing or eliminating noise of low frequency resonance with strong penetrating power generated by running of the two wind wheels by changing the rotating frequency of the wind wheels.