Liquid adding system for high-level water tank of fuel cell

The utility model discloses a fuel cell high-level water tank liquid adding system which comprises a fuel cell system, a first expansion water tank, a second expansion water tank, a cooling liquid injection port, a first water pump, a throttling device and a control module, and the fuel cell system comprises an electric pile cooling liquid flow path and an electric appliance cooling liquid flow path; a first high-position sensor is arranged on the first expansion water tank, and the water supplementing end is connected into a galvanic pile cooling liquid flow path; a second high-position sensor is arranged on the second expansion water tank, and the water supplementing end is connected into the electric appliance cooling liquid flow path; the position of the cooling liquid injection port is lower than the positions of the first expansion water tank and the second expansion water tank; the input end of the first water pump is connected with the cooling liquid injection port, and the output end of the first wat