The invention discloses an electric regulating valve for a water cooling system and a regulating method thereof, comprising a valve body, the bottom of the valve body is fixedly connected with a bottom plate, the top of the valve body is fixedly connected with a top plate, and the top of the top plate is fixedly connected A transmission motor is fixedly connected, a screw rod is fixedly connected to the output end of the transmission motor, a screw sleeve is threadedly connected to the surface of the screw rod, and a pressure rod is fixedly connected to the front of the screw sleeve. In the invention, the transmission motor is turned on by the thermometer, the transmission motor drives the screw to rotate, the screw uses the thread to push the screw sleeve to move upward, the screw sleeve can squeeze the corrugated pipe through the pressure rod during the movement, and the corrugated pipe moves upward and completes the stretching deformation. , can achieve the effect of improving the circulation distance of cooling water, solve the effect that the existing electric regulating valve cannot adjust the travel distance of cooling water according to the temperature of cooling water, seriously affect the heat dissipation distance of cooling water, and cannot meet the operation requirements of water cooling system The problem.