The invention relates to a long-acting antifouling flash coating with high hydrophobicity and corrosion resistance and a use thereof. The long-acting antifouling flash coating is prepared from aqueous fluorine carbon emulsion resin, aromatic polyurethane acrylate, organic silicone resin, dimethylaminoethyl acrylate, modified poly(3, 4-ethylenedioxythiophene)-poly(styrenesulfonate), a diluent, a leveling agent, graphene, propylene glycol, magnesium chloride, nanometer silver powder and organic bentonite. The long-acting antifouling flash coating has good water resistance, dirty resistance and corrosion resistance. The surface of the coating obviously reduces water bead, dust and charged corpuscle adsorption effects. The long-acting antifouling flash coating has good self-cleaning performances and weatherability and a good application prospect.