A pet water dispenser may include a water tank having a space to store water and an upper opening, a pump installed in the space, a water supply pipe to transfer water discharged from the pump, and a water supply plate to which water is supplied from the water supply pipe. The water tank may include a wall defining the space and a water tank base supporting the wall from below. An upper end of the wall may be smaller than a lower end of the wall, as the wall may be inclined inward from the lower end to the upper end.