NOVELTY - A hydrogen separation mold hydrogen production system, comprises: (a) carbon monoxide selection methanation device which selectively carries out methanation of carbon monoxide; (b) carbon monoxide selective-oxidation device; (c) water separator; (d) flow director of off gas separated with the water separator, and carbon-dioxide liquefaction recovery apparatus; and (e) methane separation apparatus.    USE - The hydrogen separation mold hydrogen production system is useful for industrial and commercial applications.    ADVANTAGE - The hydrogen separation mold hydrogen production system is cost-effective, efficient, reduces impurity production and has prolonged lifetime.    DETAILED DESCRIPTION - A hydrogen separation mold hydrogen production system which has the hydrogen separation mold steam reforming device by the steam reforming of hydrocarbon fuel, a combustor which is the heat sources for steam reforming of the hydrocarbon fuel, and a boiler for water vapor generation of the hydrocarbon fuel for reformation, comprises: (a) carbon monoxide selection methanation device which selectively carries out methanation of carbon monoxide in hydrogen separated from reformed gas in the hydrogen separation mold steam reforming device; (b) carbon monoxide selective-oxidation device which selectively oxidizes carbon monoxide in off gas which is remaining gas after separating hydrogen from reformed gas in the hydrogen separation mold steam reforming device; (c) water separator which separates water from the off gas after cooling off gas from the carbon monoxide selective-oxidation device; (d) flow director of off gas separated with the water separator, and carbon-dioxide liquefaction recovery apparatus containing water content adsorption tower, methane separation apparatus, compressor, heat of cooling exchanger, and gas-liquid separation tank is comprised one by one; and (e) methane separation apparatus, where after separating methane in the off gas which passed through the water-content adsorption tower and raising carbon dioxide levels, one by one, it transduces into a compressor, a heat-of-cooling exchanger, and a gas-liquid separation tank, and comes to recover a liquid dioxycarbon.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the hydrogen separation mold hydrogen production system.    Conduit pipe (1-19)