Automatic water cut-off device for defoaming agent starting tank

The utility model relates to the technical field of automatic water cut-off devices, and particularly discloses an automatic water cut-off device for a defoaming agent tank, which comprises a tank body and a suspension body arranged in the tank body, and further comprises an insulating part and a moving part vertically connected to the tank body in a sliding manner, the moving part can drive the insulating part to move, a contact block is fixed on the moving part, and the contact block is connected with the suspension body. The suspension body can push the contact block to move; two contact pieces which abut against each other are fixed on the tank body, at least one of the two contact pieces has elasticity, the contact pieces are connected with a starting circuit of the pump body, and the insulating part can be inserted between the two contact pieces. The scheme is used for solving the problems in the prior art that manual control of water cut-off exists and a sensor is easy to fail when the sensor is adopte