NOVELTY - Low-concentration methane combustion catalyst comprises a carrier, an auxiliary agent and an active component. The active component is noble metal palladium, and the total content of elemental metal is 0.1-3 wt.% of the total weight of the catalyst. The auxiliary agent comprises primary auxiliary agent and secondary auxiliary agent, where the primary auxiliary agent comprises noble metal platinum, rhodium, ruthenium, and/or iridium, and the secondary auxiliary agent comprises cerium oxide, zirconium dioxide, lanthanum oxide and/or titanium dioxide.    USE - The catalyst is used in: volatile organic compound, hydrogen, and carbon monoxide combustible gas catalytic removing process (claimed); and in coal mine gas (mine ventilation air) in low concentration methane.    ADVANTAGE - The catalyst is capable of converting methane concentration less than 1% of coal mine ventilation gas complete catalytic combustion, and has good stability and hydrothermal stability at 550 degrees C (claimed); has high activity, high stability, and long service life; saves energy; and is environmentally friendly.    DETAILED DESCRIPTION - Low-concentration methane combustion catalyst comprises a carrier, an auxiliary agent and an active component. The active component is noble metal palladium, and the total content of elemental metal is 0.1-3 wt.% of the total weight of the catalyst. The auxiliary agent comprises primary auxiliary agent and secondary auxiliary agent, where the primary auxiliary agent comprises noble metal platinum, rhodium, ruthenium, and/or iridium, where the total content of elemental metal is 0.1-20 wt.% of the total weight of the active component, and the secondary auxiliary agent comprises cerium oxide, zirconium dioxide, lanthanum oxide, and/or titanium dioxide, where the content of oxide is 1-30 wt.% to the total weight of the carrier. An INDEPENDENT CLAIM is also included for preparing either: granular catalyst, comprising (i) subjecting pseudo-boehmite, aluminum nitrate and aluminum chloride mixture for extrusion or pressing or rolling ball molding, drying at 80-150 degrees C for 2-8 hours, calcining at 500-1300 degrees C for 1-6 hours, crushing and sieving to obtain 16-20 meshes granular aluminum oxide catalyst carrier, (ii) adding secondary auxiliary agent in nitrate precursor solution with equal volume and dipping granular aluminum oxide catalyst carrier, drying at 80-150 degrees C for 2-8 hours, and calcining at 500-1100 degrees C for 1-6 hours, (iii) adding primary auxiliary agent in equal volume of precursor solution and dipping secondary auxiliary agent loaded catalyst, drying at 80-150 degrees C for 2-8 hours, calcining at 200-800 degrees C for 1-6 hours, and (iv) taking the precursor solution of active component in a crucible, adding primary and secondary auxiliary agent loaded carrier, then drying for 2-8 hours at 80-150 degrees C, calcining for 1-6 hours at 200-800 degrees C in an air atmosphere to obtain the granular catalyst; or whole structured catalyst, comprising (i) providing gamma -alumina, aluminum nitrate and pseudo-boehmite aluminum powder, adding nitric acid, planetary ball mill for 2-24 hours to obtain honeycomb ceramic carrier coating solution, (ii) impregnating honeycomb ceramic substrate material in alumina slurry for 1 minute to 1 hour, using excess compressed air to purge away excess slurry in ceramic honeycomb pore, then drying by microwave at 100 degrees C for 1-10 minutes, calcining at 500-1300 degrees C for 1-6 hours to obtain monolithic catalyst carrier coating, which can be used repeatedly for many times so that the coating loading amount achieves necessary requirements, (iii) taking secondary auxiliary agent precursor solution, loading on the carrier aluminum oxide coating by dipping method, then drying for 1-10 minutes by microwave at 100 degrees C, calcining at 500-1100 degrees C for 1-6 hours, adjusting the load weight by changing the time of impregnation of the dipping solution, (iv) taking primary auxiliary agent precursor solution, loading on the carrier aluminum oxide coating by dipping method, then drying for 1-10 minutes by microwave at 100 degrees C, calcining at 200-800 degrees C for 1-6 hours, adjusting the concentration of precursor solution, dipping times and the amount of auxiliary agent to control the load, and (v) taking the precursor solution of active component palladium by dipping method loading active components, and then drying by microwave to 100 degrees C for 1-10 minutes, calcining at 200-800 degrees C for 1-6 hours to obtain the whole structured catalyst.