NOVELTY - The multi water-gas shift membrane reactor (10) comprises a multi reactor (20) provided in an upper region with a porous barrier rib (21) to support a catalyst and in a lower region with a separation membrane (22) to separate hydrogen, first and second catalyst layers laminated on barrier rib and separation membrane respectively, a synthetic gas supply pipe, a steam supply pipe, a first outlet, a second outlet, and a support layer. The separation membrane partitions an inner region of the reactor into an upper reaction chamber (23), a lower reaction chamber (24) and a discharge chamber.    USE - The multi water-gas shift membrane reactor is useful for reacting a synthetic gas containing high-concentration carbon monoxide with a catalyst in a reactor to convert the synthetic gas into hydrogen, which is useful for fuel cells, engines and high-efficiency gas turbines.    ADVANTAGE - The multi water-gas shift membrane reactor is capable of efficiently reacting the synthetic gas containing high-concentration carbon monoxide with the catalyst thus economically producing highly purified hydrogen with high concentration and yield.    DETAILED DESCRIPTION - The multi water-gas shift membrane reactor (10) comprises a multi reactor (20) provided in an upper region with a porous barrier rib (21) to support a catalyst and in a lower region with a separation membrane (22) to separate hydrogen, first and second catalyst layers laminated on the barrier rib and the separation membrane respectively, a synthetic gas supply pipe, a steam supply pipe, a first outlet, a second outlet, and a support layer. The separation membrane partitions an inner region of the multi reactor into an upper reaction chamber (23), a lower reaction chamber (24) and a discharge chamber. The barrier rib partitions an inner region into an upper portion, a middle portion and a lower portion. The synthetic gas supply pipe is connected to the first catalyst layer of the upper reaction chamber, and supplies a synthetic gas containing high-concentration carbon monoxide. The steam supply pipe is connected to an upper region of the first catalyst layer of the upper reaction chamber. The first outlet is connected to the discharge chamber to discharge hydrogen passing through the separation membrane. The second outlet is connected to an upper region that is adjacent to the separation membrane to discharge the reaction gas not passing through the separation membrane. The support layer is arranged between the separation membrane and the second catalyst layer, where the second outlet is connected to one side of the support layer to prevent the catalyst from discharging to the second outlet. The first catalyst layer is composed of a high temperature shift catalyst to allow a catalyst reaction of a high-temperature synthetic gas, and the second catalyst layer is composed of a low temperature shift catalyst to allow a catalyst reaction of a low-temperature synthetic gas. The steam supply pipe is laid in a middle of the lower reaction chamber to collect high-temperature reaction heat. An INDEPENDENT CLAIM is included for a method for producing hydrogen using a multi water-gas shift membrane reactor.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a multi water-gas shift membrane reactor.    Multi water-gas shift membrane reactor (10)    Multi reactor (20)    Porous barrier rib (21)    Separation membrane (22)    Upper reaction chamber (23)    Lower reaction chamber. (24)