A water separator with a shower seat includes a valve body, a frictional unit, a shower seat, and a water outflow switching mechanism. The valve body is provided with a plurality of snap-fit joints disposed circumferentially. The frictional unit is mounted on the valve body and an outer wall thereof is provided with a first frictional surface. The shower seat is provided with a connecting chamber having an open end, and a snap-fit surface and a second frictional surface are circumferentially disposed in the connecting chamber, respectively. The water outflow switching mechanism is mounted in the valve body. Hook heads of the snap-fit joints are snapped to the snap-fit surface to prevent the shower seat from getting separated from the valve body. When the shower seat rotates with respect to the valve body, the first frictional surface and the second frictional surface rotate accordingly and interact with each other.