Biogas filling and inflating device for vehicle

The utility model discloses a vehicle biogas filling and inflating device which comprises a base, a biogas tank is fixedly installed on one side of the top end of the base through a support, a low-temperature plunger pump is fixedly installed in the middle of the top end of the base, a gas inlet of the low-temperature plunger pump is fixedly connected with one end of a gas inlet pipe, and the other end of the gas inlet pipe is fixedly connected with a gas conveying port of the biogas tank. A backflow pipe is fixedly installed in the middle of the bottom end of the biogas tank, a vacuum pump isfixedly installed on the other side of the top end of the base, and a gas outlet of the low-temperature plunger pump is fixedly connected with one end of a gas outlet pipe. The methane in the methanetank is compressed through the low-temperature plunger pump, the methane can be secondarily gasified in the compression process, and in cooperation with the return pipe, gas flows back into the methane tank to be stored, so t