The invention relates to modified metal anti-corrosion paint and a preparation method thereof. The modified metal anti-corrosion paint is prepared from the following raw materials in parts by weight: 1-8 parts of waterborne acrylic modified epoxy resin, 1-20 parts of bisphenol A type epoxy resin, 2-16 parts of polyaniline, 2-8 parts of dimethylbenzene, 1-9 parts of dicyandiamide, 3-20 parts of dibutyl phthalate, 2-20 parts of polyacrylate and 1-20 parts of dibutyltin dilaurate. The modified metal anti-corrosion paint prepared by the method is excellent in anti-corrosion performance, rust protection performance, heat resistance, acid resistance, alkali resistance and salt resistance as well as convenient in construction and cleaning, can be matched with various solvent-based paints for use, does not cause a phenomenon of zinc fog, and meets the demands of people.