Automatic liquid supplement device for sealed circulation cooling system

An automatic liquid supplement device for a sealed circulation cooling system comprises the sealed circulation cooling system and is further provided with a liquid storage tank and a transit tank. A tank bottom of the liquid storage tank is connected to a tank bottom of the transit tank trough a single-way valve, and the flow direction of the first single-way valve flows to the transit tank from the liquid storage tank. A piston type seal element is arranged inside the transit tank, a transmission straight rod is connected with the upper end of the piston type seal element, and the upper end of the transmission straight rod extends out of the top of the transition tank to be connected with a driving actuating mechanism. The bottom of the transit tank is connected to the sealed circulation cooling system through a second single-way valve, and the flow direction of the second single-way valve is from the transit tank to the sealed circulation cooling system. The liquid storage tank is provided with a liquid adding opening and is further provided with a central processor, the sealed circulation cooling system is provided with a pressure detector, and a pressure detector is connected to the central processor connected to the driving actuating mechanism. The automatic liquid supplement device for the sealed circulation cooling system can automatically supplement liquid for the sealed circulation cooling system in time.