NOVELTY - The multi-fluidized bed water-gas shift reactor comprises a gas reaction tank (20) having upper and lower chambers separated by a compartment (21) placed in the middle of the tank and in which a syngas containing a high concentration of carbon monoxide reacts with a catalyst to convert the syngas into hydrogen, and a high temperature catalytic reaction chamber as the lower chamber is partitioned in the tank by the compartment including a top reaction space in which a high temperature catalyst converting carbon monoxide into hydrogen at a high temperature is loaded and a bottom mixing space.    USE - The multi-fluidized bed water-gas shift reactor is useful for production of hydrogen (claimed), which is useful as an energy source for a fuel cell vehicle, a hydrogen engine and a high efficiency hydrogen-combined power generation unit.    ADVANTAGE - The multi-fluidized bed water-gas shift reactor is capable of consistently producing hydrogen without heat loss and serious environmental problems including global warming and with less energy consumption.    DETAILED DESCRIPTION - The multi-fluidized bed water-gas shift reactor comprises a gas reaction tank (20) having upper and lower chambers separated by a compartment (21) placed in the middle of the tank and in which a syngas containing a high concentration of carbon monoxide reacts with a catalyst to convert the syngas into hydrogen, and a high temperature catalytic reaction chamber as the lower chamber is partitioned in the tank by the compartment including a top reaction space in which a high temperature catalyst converting carbon monoxide into hydrogen at a high temperature is loaded and a bottom mixing space receiving a mixed gas and a steam. The spaces are partitioned by a porous plate. A syngas input line (23) and a steam input line (24) are connected to the bottom mixing space to flow the steam and the syngas heated by a preheater (25) into the bottom space and disperse the syngas and the steam into the top reaction chamber and a low temperature catalytic reaction chamber as the top reaction chamber partitioned in the tank by the compartment. A low temperature catalyst is loaded in the top chamber. The gas reformed after reaction is discharged outside through a low temperature reaction gas output line connected to a top of the chamber. A cyclone is used to receive the reformed gas after performing the high temperature reaction from a high temperature reaction gas output line connected to the top of the high temperature catalytic reaction chamber and conducting solid-gas separation to separate a gaseous ingredient e.g. a high temperature reaction gas. The reaction gas is fed into a lower side of the low temperature catalytic reaction chamber through a high temperature reaction gas input line while the catalyst as the separated solid ingredient returns to the high temperature catalytic reaction chamber through a catalyst recycling line. The top reaction space of the high temperature catalytic reaction chamber and the low temperature catalytic reaction chamber have a first heat exchanger and a second heat exchanger respectively to decrease a temperature of the reaction gas output. An auxiliary output line equipped with a sluice valve is connected to a top of the low temperature catalytic reaction chamber, and an auxiliary cyclone is fixed at one side end of the auxiliary output line to recover and discharge a catalyst powder generated due to abrasion by repetitive reaction in the fluidized bed. The steam generated by heat exchange in the first heat exchanger is fed into the bottom mixing space of the high temperature catalytic reaction chamber via a circulation line. An INDEPENDENT CLAIM is included for a method for production of hydrogen using a syngas.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a multi-fluidized bed water-gas shift reactor.    Gas reaction tank (20)    Separating compartment (21)    Catalyst inlet (22)    Syngas input line (23)    Steam input line (24)    Preheater. (25)