The invention provides a hydrogen catalytic recombiner. The hydrogen catalytic recombiner comprises a recombiner body and a heating device arranged outside the composite device body. The heating device comprises an active heating device and a passive heating device. According to the hydrogen catalytic recombiner, a pre-heating mode is adopted to heat the core-metal surface catalytic panel area ofthe hydrogen catalytic recombiner, and the heating capacity is precisely designed, so that the temperature of the panel area is higher than the critical temperature at which a reaction can be carriedout on hydrogen and oxygen under the gas poisonous effect of carbon monoxide and the like, and thus the hydrogen-oxygen catalytic reaction can be started. After the reaction is started, the temperature of the catalyst region can be maintained by the heat released by the reaction of the hydrogen and the oxygen, so that the reaction can be continued, and the starting failure of the hydrogen-oxygen reaction of the recombiner under the poisoning of the carbon monoxide is avoided.