Pressure water supply device

The invention discloses a pressure water supply device. According to the pressure water supply device, a water storage tank is a sealed tank body, a water inlet and a water outlet are formed in the lower surface of the water storage tank to achieve water inlet and water outlet correspondingly, water in an external water supply pipe flows into the water storage tank through a water inlet channel and the water inlet, and the water in the water storage tank flows to a water requiring pipe through the water outlet and a water outlet channel; the water inlet and the water outlet are formed in the lower surface of the water storage tank, so that all water can flow out of the water storage tank, and the emptying rate of the water storage tank is improved; when water needs to be drained outwards, a three-way valve enables an air pump to be in communication with the water storage tank, the water storage tank is inflated, the air pressure of the upper space of the water storage tank is increased, and water is drained o