NOVELTY - Preparation of metal-doped mesoporous molecular sieve involves adding template agent, alkali source, silicon source and metal source into a reactor, stirring at 20-40 degrees C for 0.5-24 hours, carrying out hydrothermal reaction of obtained emulsion at 80-180 degrees C for 12 hours or more or reacting using microwave under power of 200-2100 W for 1-10 hours, cooling reaction mixture, filtering, washing obtained product to neutral, drying, and calcining obtained solid at 400-800 degrees C for 1-15 hours. The metal-doped mesoporous molecular sieve has specific surface area of 200-1500 m2/g.    USE - Preparation of metal-doped mesoporous molecular sieve used as catalyst for preparing methane synthesis gas (claimed).    DETAILED DESCRIPTION - Preparation of metal-doped mesoporous molecular sieve involves adding template agent, alkali source, silicon source and metal source into a reactor, stirring at 20-40 degrees C for 0.5-24 hours, carrying out hydrothermal reaction of obtained emulsion at 80-180 degrees C for 12 hours or more or reacting using microwave under power of 200-2100 W for 1-10 hours, cooling reaction mixture, filtering, washing obtained product to neutral, drying, and calcining obtained solid at 400-800 degrees C for 1-15 hours. The metal-doped mesoporous molecular sieve has specific surface area of 200-1500 m2/g, pore volume of 0.5-3 cm3/g, and pore diameter of 2-15 nm. The metal-doped mesoporous molecular sieve has catalytic activity at 200-550 degrees C. The catalytic activity of the metal-doped mesoporous molecular sieve is not reduced when calcined at 700 degrees C for 20 hours. The ratio of template agent, alkali source, silicon source and metal source is 0.06-0.24:0.1-0.3:1:0.01-0.20. The template agent includes quaternary ammonium salt of formula (I). The alkali source is sodium hydroxide or potassium hydroxide. The silicon source is silicon glue, silica sol or N-alkyl silicate. The metal source is water-soluble or alcohol-soluble nickel salt, alkali metal salt, rare earth metal salt and/or metal element (A) chosen from group IVB-VIIB of periodic table.    R1-R4=1-22C alkyl;    or at least one of R1-R4=8-22C alkyl;and    X=halo.    An INDEPENDENT CLAIM is included for application of metal-doped mesoporous molecular sieve as catalyst in preparation of methane synthesis gas.