NOVELTY - Composite methanation catalyst is prepared by dropping ethanol nitric acid mixed aqueous solution to titanic acid butyl ester ethanol solution to obtain sol; drying sol to form gel and sintering gel to obtain titanium dioxide (TiO2) nanopowder; adding TiO2 nanopowder aqueous suspension with sodium carbonate (Na2CO3) solution as precipitating agent and nickel nitrate (Ni(NO3)2) and aluminum nitrate (Al(NO3)3) as catalyst precursor, precipitating, aging, and filtering; and drying filter cake and sintering to prepare nickel(II) oxide/titanium dioxide/ gamma aluminum oxide catalyst.    USE - Method of preparing composite methanation catalyst (claimed).    ADVANTAGE - The method can prepare catalyst having high activity, resistance to carbon deposition, and long service life.    DETAILED DESCRIPTION - Preparation of composite methanation catalyst comprises:    (A) mixing tetrabutyl titanate and anhydrous ethanol at volume ratio of 1:2-1:5 and uniformly stirring to obtain titanic acid butyl ester ethanol mixed solution;    (B) mixing deionized water and anhydrous ethanol at volume ratio of 1:1, and adding nitric acid to adjust pH value to 3-4 to obtain ethanol nitric acid mixed aqueous solution;    (C) slowly dropping the aqueous solution to the titanic acid butyl ester ethanol mixed solution using peristaltic pump at rate of 5 ml/minute, stirring at 1000-1500 revolutions/minute for 3 hours to obtain sol;    (D) drying the sol for 24 hours at 80 degrees C to form gel, and sintering gel in a muffle furnace at 500 degrees C for 2-4 hours to obtain TiO2 nanopowder;    (E) adding 1-1.5 g TiO2 nanopowder with deionized water and ultrasonically mixing to form uniform suspension;    (F) adding suspension with 0.5 mol/L Na2CO3 solution as precipitating agent, and Ni(NO3)2 and Al(NO3)3 as catalyst precursor, keeping temperature at 30-80 degrees C and pH value to 9-10, and after completely precipitating, continuously aging for 8-20 hours; and    (G) filtering, washing filter cake with deionized water to pH value of 7, drying at 110 degrees C for 4-6 hours, then sintering for 4-6 hours at 400-600 degrees C to prepare nickel(II) oxide/titanium dioxide/ gamma aluminum oxide (NiO/TiO2/Al2O3) catalyst.