The cooling water flows into the water distribution pipe through the water inlet pipe and the water distributor, and then forms a water flow through the spray hole on the water distribution pipe and sprinkles on the filler of the cooling tower. Because the diameter of the orifice is relatively small, the water flow has a certain speed. According to the principle of force and reaction, the water distribution pipe is rotated by the force opposite to the water flow direction, so that the water flow is continuously distributed to the filler of the cooling tower. The water adheres to the packing surface and forms a water film flow, which increases the water vapor contact interface. The air in the tower flows reversely with the water flow for heat exchange, which vaporizes part of the water and takes away the heat, thus reducing the water temperature.