NOVELTY - A carbon monoxide (CO) removing method from reformed hydrogen comprises putting reformed hydrogen into two periods of catalytic methanation reactions, where in first period, first methanation catalyst is used to remove CO at 330-180 degrees C; and percentage composition of CO in volume is reduced less than or equal to 0.1% at the same time when conversion rate of carbon dioxide (CO2) is kept less than or equal to 5%; and in the second period, second methanation catalyst is used to remove CO at 220-110 degrees C; and percentage composition of CO in volume is reduced less than or equal to 30 ppm at the same time when conversion rate of CO2 is kept less than or equal to 5%.    USE - The method is useful for removing CO from reformed hydrogen (claimed).    ADVANTAGE - The CO removing method from reformed hydrogen can remove the CO to a great extent and avoid the anode poisoning of proton exchange membrane fuel cell; because only a small amount of CO2 takes the methanation reaction, the efficiency is high; and the operating temperature range is wide in the methanator in each period to be beneficial to the design of the equipment and the control system.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a piece of CO removal equipment from reformed hydrogen, comprising a methanator for the first period and a methanator for the second period, where the high-selectivity methanation catalyst is filled in the methanator for the first period; and the high-activity methanation catalyst is filled in the methanator for the second period;    (2) a power generation method for proton exchange membrane fuel cell, comprising carrying out reforming reaction to the hydrocarbon to prepare hydrogen; carrying out CO conversion reaction to the reformed gas to reduce the CO content less than or equal to 2.0%; carrying out methanation reaction to the converted gas to lower the content of the CO less than or equal to 30 ppm by volume; introducing the gas after the methanation reaction into the proton exchange membrane fuel cell for power generation, where the methanation is divided into two periods, in the first one, the high-selectivity methanation catalyst is adopted to remove the CO at 330-180 degrees C; and in the second one, the high-activity methanation catalyst is adopted to remove the CO at 220-110 degrees C; and    (3) a power generation system for proton exchange membrane fuel cell, comprising a reforming reactor, a CO conversion reactor, a piece of CO removal equipment and a proton exchange membrane fuel cell, where the CO removal equipment comprises the methanator for the first period and the methanator for the second period.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of a CO removing method from reformed hydrogen (Drawing includes non-English language text).