The utility model discloses a water fountain for pigs, which is characterized in that a tap water pipe and a water drinking spray nozzle are arranged in the middle position inside a case, the tap water pipe and the water drinking spray nozzle are connected through an electromagnetic valve switch, a control circuit is connected on the electromagnetic valve switch, and is connected with a power supply and an infrared ray probe arranged on the top end inside the case through a conducting wire, the lower end of the inside of the case is provided with a water basin, and the lower end of the water basin is connected with a U-shaped drainage pipe. Through the arrangement, the utility model is arranged in a hogpen, when pigs want to drink water, the infrared ray probe can receive infrared ray signals for switching on the electromagnetic valve switch when the pig extends the mouth to a position above the water basin, the water drinking spray nozzle begins to spray water, and the pigs can directly drink the water. The rest water can fall in the water basin to flow into a water drain. The utility model has the advantages of simple structure, convenient installation, water saving, practicability and no hogpen pollution.