The invention provides an automatic water disperser for livestock and poultry, and relates to a structural improvement on the automatic water disperser for the livestock and the poultry. According to the automatic water disperser provided by the invention, automatic water supply can be guaranteed, and the phenomenon of water leakage can be avoided. The automatic water disperser comprises a water tank and a water supply pipe. The automatic water disperser is characterized in that a communicating pipe is arranged on the side of the water tank, and the bottom of the communicating pipe is communicated with the bottom of the water tank; a water outlet communicated with the communicating pipe is formed in the water supply pipe, and the height of the upper end of the water supply pipe is smaller than that of the upper end of the water tank.