The invention discloses a screw, an electrical grounding structure of a compressor based on the screw, and an air conditioner, wherein the screw for fixing the compressor on a chassis of an electric appliance orderly crosses through an installing foot and a damping cushion ring of the compressor from top to bottom so as to fix the compressor on the chassis of the electric appliance; the installingfoot is sleeved at the upper end of the damping cushion ring and there is a gap between the installing foot and the outer circumference surface of the screw; the end part of the screw at one side ofthe installing foot is provided with a thread hole. By directly connecting the grounding wire with the screw for supporting the compressor installing foot, and then connecting with the chassis by means of the screw and effectively connecting with other metal parts of the air conditioners until an electric appliance box, thus the grounding system of the compressor is formed, and the grounding performance of the compressor is ensured.