Waterway connection system for vacuum calorimeter

The invention discloses a waterway connection system for a vacuum calorimeter. The waterway connection system comprises a water inlet valve, a discharge pump and a circulating water pump, wherein an inlet end of the water inlet valve is connected with a feed water inlet of a constant-temperature unit and an outlet end is connected with a water inlet and outlet pipe; the water inlet and outlet pipe is introduced to the bottom of a vacuum inner cylinder along the upper edge of the vacuum inner cylinder; the inlet end of the discharge pump is connected with the water inlet and outlet pipe and the outlet end is connected with a water return opening of the constant-temperature unit; the inlet end of the circulating water pump is connected with a heating device and a refrigerating device in series; the inlet end of the heating device or the refrigerating device is connected with a water outlet of a water tank; the water return opening of the constant-temperature unit is connected with a water inlet of the water tan