A water supplier for a pet according to an embodiment of the present disclosure includes: a water tub being open upward and having a side wall; a pump installed in the water tub; a water supply pipe connected to the pump to deliver water; and a water supply plate disposed higher than the water tub, having a water supply hole communicating with the water supply pipe, and passing water supplied from the water supply hole, in which a floor plate of the water tub has a first drain.