Automatic unloading valve and high-pressure water pump

The utility model provides an automatic unloading valve and a high-pressure water pump. The automatic unloading valve is arranged in a high-pressure water pump, the high-pressure water pump comprises a pump body and a water outlet connector, the pump body is provided with a water outlet flow channel and an overflow port, the front end portion of the water outlet connector is installed in the rear end portion of the water outlet flow channel, the rear end portion of the water outlet connector is connected with a spray gun, and the automatic unloading valve comprises a valve seat fixedly arranged in the front end portion of the water outlet flow channel, a valve seat through hole is formed in the center; the valve element is movably installed in the valve seat through hole, and the rear end of the valve element extends out of the end face of the valve seat through hole to form a switch end enabling the valve body through hole to be closed or opened. The cone valve seat is movably mounted in the water outlet run