NOVELTY - High-selectivity carbide catalyst comprises a molybdenum carbide catalyst, a tungsten carbide catalyst, a metal modified molybdenum carbide catalyst and/or a metal modified tungsten carbide catalyst.    USE - The catalyst is useful for preparing tetrahydronaphthalene by naphthalene hydrogenation; and in oxygen reduction reaction, ammonia decomposition reaction and glycerol conversion reaction of fuel cell cathode (claimed).    ADVANTAGE - The catalyst is economical and has 100% selectivity during the preparation of tetrahydronaphthalene by naphthalene hydrogenation. The method is environment-friendly, convenient and rapid, has simple preparation process, saves energy consumption, uniformly disperses carbide particles on the carrier, and avoids carbon deposition on the surface.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high-selectivity carbide catalyst comprising: preparing a carbide precursor by mixing and grinding a single-source precursor containing a corresponding metal with a carrier to obtain a carbide precursor, or loading a single-source precursor containing a corresponding metal onto a carrier by solution immersion method, evaporating solvent to remove the precursor, and drying; preparing metal modified carbide precursor by mixing and grinding a single-source precursor containing a corresponding metal, metal salt and a carrier, or loading a single-source precursor containing a corresponding metal and a metal salt onto a carrier by solution immersion method, evaporating solvent to remove the precursor, and drying; and placing the carbide precursor and the metal modified carbide precursor respectively in a microwave rector, performing microwave pyrolysis of the precursors in an inert gas atmosphere, and naturally cooling the precursors to room temperature in an gas atmosphere to obtain a carbide catalyst and a metal modified carbide catalyst, where the amount of the metal in the single-source precursor is 5-50 wt.% and the single-source precursor containing a corresponding metal is molybdenum-hexamethylenetetramine complex and hexacarbonyl tungsten.