NOVELTY - A slurry bed methane synthesis comprises generating coal gas by gasification, purifying and converting to obtain methane raw material gas, and dispersing Raney nickel catalyst in inert liquid medium; discharging gas phase I from top of gas liquid separator I after the natural gas product by cooling and separating; discharging methanation catalyst containing inert liquid phase medium from gas-liquid separator II, and combining with discharge slurry liquid phase component I; and filtering large catalyst particles and separating fine catalyst.    USE - Slurry bed methane synthesis.    ADVANTAGE - The method utilizes Raney nickel catalyst which does not reduce, and has higher mechanical strength and better wear resistance.    DETAILED DESCRIPTION - Slurry bed methane synthesis comprises:    (A) generating coal gas by gasification, purifying and converting to obtain methane raw material gas, and dispersing Raney nickel catalyst in inert liquid medium;    (B) adding water to slurry-bed reactor, raising temperature to reaction temperature, introducing product gas after exchanging heat with raw material gas into gas-liquid separator I, and discharging gas-liquid phase in product and catalyst component slurry liquid phase component I from bottom of gas liquid separator I phase I; and    (C) discharging catalyst-containing inert liquid phase medium from slurry-bed reactor middle part, entering in gas-liquid separator II, discharging concentration of air phase II from the top of gas-liquid separator II, discharging gas phase I from top of gas liquid separator I after the natural gas product by cooling and separating, discharging methanation catalyst containing inert liquid phase medium from gas-liquid separator II, and combining with discharge slurry liquid phase component I, filtering large catalyst particles of less than 300 meshes and separating fine catalyst of more than 300 meshes with inert liquid phase medium, and carrying out cooling.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating a slurry bed methane synthesis. (Drawing includes non-English language text).