NOVELTY - Integral catalyst comprises carrier, two groups of active components and optionally silicon oxide. The carrier is integral silicon carbide honeycomb. The active components comprises noble metal (0.1-20 wt%) and non-noble metal (0.1-20).    USE - The integral catalyst is useful for selectively oxidizing and eliminating carbon monoxide from hydrogen (claimed) existing in water vapor and/or carbon dioxide gas and eliminating carbon monoxide from industrial reaction system and raw material gas of hydrogen oxygen proton fuel cell.    ADVANTAGE - The integral catalyst completely eliminates carbon monoxide.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of preparing the above-mentioned integral catalyst, which involves (a) treating (in absence of silicon oxide) the integral silicon carbide honeycomb carrier using concentrated nitric acid (20-40%) for 8-10 hours at 100-120 degrees C, washing and drying the treated carrier, sintering the dried carrier for 1-6 hours at 1000-1200 degrees C, soaking the treated carrier asteriskasteriskasteriskusing aqueous solution containing catalyst active component, drying the soaked catalyst at room temperature, treating the material using a negative pressure device at 40-120 degrees C for 2-24 hours, reducing the treated material using hydrogen at 60-400 degrees C for 1-10 hours to obtain the integral catalyst capable of directly loading the active component on the silicon carbide and (b) treating (in presence of silicon oxide) the integral silicon carbide honeycomb carrier using concentrated nitric acid (20-40%) for 8-10 hours at 100-120 degrees C, washing and drying the treated carrier, soaking the dried carrier using silicon carbide colloid (10-15 %mass) for 1-10 minutes, obtaining the soaked carrier having velocity of 0.1-3 cm/min, drying the obtained carrier at room temperature and drying for 1-4 hours at 130-150 degrees C, sintering the dried carrier for 1-4 hours at 400-500 degrees C, repeating the above-mentioned process for seven times to obtain silicon carbide integral composite carrier, soaking the obtained carrier using the aqueous solution containing catalyst active component, drying at room temperature, treating the dried material using negative pressure device for 2-24 hours at 40-120 degrees C and reducing the treated material using hydrogen at 60-400 degrees C for 1-10 hours.