This utility model discloses a novel drinking water device for cattle, belonging to the technical field of drinking water facilities for cattle. The utility model includes a base, a drinking device, a
buoyancy-based water-blocking structure, and two side water-blocking structures. The drinking device is fixedly installed on the front of the base, providing stepped support. The
buoyancy-based water-blocking structures are located on both sides inside the drinking device, utilizing the
buoyancy within the device to seal it. This utility model utilizes the cooperation of pipes,
pipe-blocking columns, and a buoyancy plate within the buoyancy-based water-blocking structure. When the
water level in the cattle drinking trough drops, the buoyancy plate lowers with the
water level, causing the
pipe-blocking columns to move downwards via a vertical rod, allowing water from the storage box to automatically flow into the cattle drinking trough through the pipes. When the
water level rises to a set height, the buoyancy plate, driven by buoyancy, moves the
pipe-blocking columns upwards to seal the pipes. Automatic water filling is achieved without
electricity, avoiding the risk of electric leakage that may occur with electric drives, while also reducing the complexity of cattle farming operations.