The invention belongs to the technical field of cultivation, and discloses a watering device for a mountain-land chicken farm. The watering device comprises a water injecting pipe slantly arranged along a slope. The upper end of the water injecting pipe is closed, a set of water injecting holes is formed in the lower side of the water injecting pipe and evenly distributed in the axial direction of the water injecting pipe, a water tank is arranged below each water injecting hole, and the water tanks are connected with the water injecting pipe through chains. A power pipe slantly arranged along a slope is arranged on the upper side of the water injecting pipe and communicated with a ventilating pipe, a sealing cover is arranged at the end of the ventilating pipe, a piston is arranged in the power pipe, and a piston rod is arranged at the upper end of the piston. The watering device further comprises a sealed water storage tank, and the water storage tank is communicated with the lower end of the water injecting pipe and the lower end of the power pipe. By means of the watering device for the mountain-land chicken farm, the technical problems that when chickens are cultivated on slope mountain land at present, watering is complex, and labor intensity is large are solved.