PURPOSE: An automatic drinking water fountain is provided to improve efficiency and convenience of rearing cow by automatically generating water level control supplying work to the drinking water fountain. CONSTITUTION: An automatic drinking water fountain comprises a tub(100), a supplying pipe(200), a heater, a heat exchange box(400), a drinking water supplying means(500), a warm water circulating pipe, and a controller(600). The tub comprises a floor part formed with drainage on one side of the lower part and a side board to cover the edges of the floor part. The supplying pipe is installed to penetrate to inside of the tub from exterior of tub through the floor part and supplies water. The heater is installed to cover the exterior of the supplying pipe on the exterior of tub and heats water supplied through the supplying pipe. The heat exchange box is installed inside of tub and connected to the supplying pipe to accommodate heated water through the heater and supplies heat to prevent water inside of tub from freezing through accommodated heated water. The drinking water supplying means supplies accommodated heated water inside of the heat exchange box to inside of tub and controls the supplied water level inside of tub. The warm water circulating pipe circulates water inside of heat exchange box and continuously supplies to circulate heated water to the heat exchange box through the heater. The controller controls the operation of heater.급수기 내부로 물의 수위를 조절 공급하는 작업이 자동으로 실행되도록 하여 소를 사육하는 작업의 효율성 및 편리성이 향상되고, 물을 직접 데워 수조에 공급하고 온수가 계속 순환하면서 수조의 물과 열교환이 이루어지도록 구성되어 수조의 물이 얼지 않도록 열을 공급할 수 있도록 할 수 있을 뿐만 아니라, 소의 사육상태에 따라 수조의 높이를 선택적으로 조절할 수 있도록 하는 축사용 자동급수기가 개시된다.
