The mixed gas after reaction is passed though the heat exchanger to have the heat exchanged with feed gas in order to recover part of heat and then fed further into the gas-liquid separation buffer to separate the unreacted methanol and water, prior to passing to the condenser and cooling gas dryer for condensation in order to ensure the methanol in the reforming gas to meet the specified quality. The liquid from condensation and separation is the mixture of methanol and water, which are returned back to the feedstock tank for reuse. The reformed gas enters a set of PSA system, which separates all impurities through the adsorption and separation in one time. The hydrogen purification through PSA is adopted in the manner of 4-1-2/P and desorption at the atmospheric pressure (4 absorbers, one absorber is in adsorption, 2 times of pressure equalization). Each adsorber in a cycle undergoes adsorption (A); equalized pressure-drop for the first time (E1D); equalized pressure-drop for the second time (E2D); cis-exhale (PP), inverse purge (D); flushing (P); equalized pressure increase for the second time (E2R); equalized pressure increase for the first time (E1R) and the final pressurisation (FR). The four adsorbers shift regularly, alternating between adsorption and regeneration, according to the arranged program in a closed loop. In this way raw gas feeds and hydrogen withdraws continuously. There are a small amount of carbon monoxide and about 35%(v/v) hydrogen in the desorbed off gas. If it is recovered and used as fuel, it brings the benefit of saving energy and minimizing the pollution.