The utility model discloses a plant uses feeding device, including raceway and a plurality of drinking water unit, drinking water unit parallel connection is on the raceway, the drinking water unit includes inlet tube and drinking bowl, and the drinking bowl passes through inlet tube and defeated water piping connection, and is provided with the water intaking valve on the inlet tube, the drinking bowl includes water storage chamber and trough, the bottom left end in water storage chamber with advance water piping connection, the bottom right -hand member in water storage chamber passes through valve plate subassembly and is connected with the trough, valve plate subassembly passes through the relay and is connected with power supply, installs level gauge I and lower level gauge I at the water storage intracavity, install level gauge II and level gauge II down in the trough, go up level gauge I, down level gauge I, go up level gauge II and down level gauge II be connected with the input of controller respectively, water intaking valve and valve plate subassembly's relay is connected with the output of controller. The utility model discloses degree of automation is high, and supplies water according to the difference of each drinking bowl and difference, the water economy resource, and messenger's water resource is effectively utilized.