The invention discloses a polypropylene-graphene color master batch with a high fading resistance and a preparation method thereof. The raw materials of the color master batch comprise graphene oxide, polypropylene, sodium sterate, acrylamide, an antioxidant, dibutyl phthalate, calcium silicate, a promoter, N,N-dimethylethanolamine and poly(ethyleneglycol p-phthalate). The preparation method comprises firstly adding graphene oxide into water to form a suspension, then successively adding acrylamide and ethanol into the suspension, performing stirring, adding dibutyl phthalate and N,N-dimethylethanolamine, performing heating for reaction, then adding the promoter, performing boiling, steaming an obtained mixture to dry, mixing the dried material, polypropylene, sodium stearate, the antioxidant, calcium silicate and poly(ethyleneglycol p-phthalate), performing grinding, and performing extrusion granulation on the ground material, so as to obtain the polypropylene-graphene color master batch with the high fading resistance. By modifying graphene, the heat resistance, light fastness and oxidation resistance of graphene are enhanced, and also the prepared color master batch is good in dispersibility, good in color reappearance and excellent in color fading resistance.