Safe storage tank for vehicle biogas

The safe storage tank comprises a first tank body and a second tank body, a vacuum pump is fixedly installed at the top end of the first tank body, an air exhaust opening of the vacuum pump is fixedlyconnected with one end of an air exhaust hose, and an air outlet of the vacuum pump is fixedly connected with one end of an air outlet pipe. The methane cooling device has the advantages that methanein the second tank body can be heated conveniently through the arranged heater, water in the water storage tank is pumped into the cooling pipe through mutual cooperation of the arranged circulatingpump and the arranged condenser, and therefore the methane in the water storage tank can be cooled through the cooling pipe, and the methane cooling device can be used for cooling the methane in the second tank body. And meanwhile, a double-path temperature controller is matched, a heater is automatically controlled to heat, and when the temperature reaches a set value, the heater is automaticallycontrolled to stop working,