Water circulation device capable of automatically replenishing water to prevent overheating and vacuum filling system applying same

The utility model discloses a water circulation device capable of automatically replenishing water to prevent overheating and a vacuum filling system applying the same. The water circulation device comprises a water pumping device and a water circulation tank, wherein the water pumping device and the water circulation tank form a loop, the water circulation tank is provided with a water replenishing pipeline, an automatic water replenishing valve and a temperature detection device detecting the water temperature and controlled by an electric control system. The vacuum filling system comprises a vacuum filling machine and the water circulation device capable of automatically replenishing water to prevent overheating. The water pumping device is a water circulation type vacuum pump. By means of the temperature detection device, the water temperature in the water circulation tank can be monitored in real time, the automatic water replenishing valve can be timely opened to replenish water to control the water tem