The present invention relates to a water feeding device for a cage for poultry farming, which has an effect of not only reducing the installation costs compared with installation of a single water feeding device which can automatically control height of the water feeding device before by installing a water feeding device having height that chicks can drink and a water feeding device having height that the chickens can eat after growing in a cage, but also excellently cleaning poultry waste by smoothly discharging the poultry waste to prevent water drops from the water feed device from being mixed with the poultry waste. The water feeding device for a cage for poultry farming including a poultry waste transfer belt (100) installed on the lower part of the cage is characterized by comprising a first water feeding pipe (300a) having first nipples (310a) on the bottom installed in a certain distance on the lower part inside the cage (200) in the longitudinal direction of the cage (200) vertically extended, so that chicks can eat； a highly located second water feeding pipe (300b) which is installed on the upper side inside the cage (200) in the longitudinal direction of the cage (200) and which has second nipples (310b) spaced from each other on the bottom so that grown chickens can eat； and a water storage plate (400) installed on the lower part of the second water feeding pipe (300b), receiving the water dropped from the second nipples (310b) of the second water supply pipe (300b) not to be dropped into the poultry waste transfer belt (100), and guiding the water to the outside.본 발명은 양계용 케이지의 급수장치에 관한 것으로서 종래 케이지내에 설치되는 급수장치는 병아리때 먹을 수 있는 높이와 성장한 닭이 먹을 수 있는 높이로 자유롭게 조절될 수 있는 자동식 구조이므로 그만큼 설치비용이 많이 들어가게 되는 것이고, 또한, 성장한 닭의 경우에는 물을 먹지 않는데에도 불구하고 몸집이 커서 활동하는 도중 급수장치의 니플을 자주 건드려 불필요하게 물을 떨어뜨리는 것이고, 떨어진 물은 계분이송벨트의 계분에 섞여 계분을 질퍽하게 만들면서 계분이송벨트에 계분을 달라붙게 하여 별도의 작업을 통하여 계분이송벨트에서 계분을 치워야 하므로 많은 인력손실이 있었다.따라서 본 발명은 케이지 하부에 계분이송벨트(100)가 설치되는 양계용 케이지의 급수장치를 구성함에 있어서, 종방향으로 길게 형성되는
