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PURPOSE : A heat-insulating wall finishing material composition using synthetic leather and a manufacturing method thereof are provided to improve thermal insulation of wall paper by adding a insulating material with high thermal efficiency to a synthetic leather resin layer. CONSTITUTION : A heat-insulating wall finishing material composition using synthetic leather comprises 50-55% of synthetic leather resin, 20-25% of vermiculite(mica-based) heat-insulating composite material, 5-10% of inorganic ore material mineral, 5% of inorganic ceramic binder, 5% of zeolite, 3% of antibacterial agent, 5% of heptadecane, and 2% of flame retardant. A manufacturing method of the synthetic leather wallpaper comprises next steps : impregnation stirring heptadecane with a synthetic leather wallpaper base binder at 75-80 deg. Celsius; mixing vermiculite(mica-based) powder, inorganic rare earth ore material powder, zeolite powder, antimicrobial agent powder and flame resisting fireproofing with the mixture from the previous step; mixing inorganic ceramic binder with the mixture from the previous step in order to obtain a synthetic leather insulation wall finishing material composition; manufacturing a synthetic leather layer by molding the finishing material composition at high temperature; and coadunating a rear side to the synthetic leather layer.