Livestock trough with function of automatic water supply

A livestock trough with a function of automatic water supply belongs to livestock supplies and comprises a water tank, a float and a water pump. The livestock trough is characterized in that the float is disposed in the water tank and is connected with a control rod, the middle of the control rod is fixed to the edge of the water tank through a rotary shaft, an electrode is arranged at the other end of the control rod, another electrode is correspondingly arranged above the electrode, both the electrodes are connected with power cords, the water pump is serially connected to one power cord, and a water outlet pipe of the water pump is connected inside the water tank. The livestock trough is capable of automatically supplying water in case of water deficiency, and accordingly the trouble of frequently observing water deficiency of the water tank is avoided for people, and labor is reduced.