The invention discloses modified aqueous alkyd resin coating, which comprises the following raw materials in parts by weight: 70-85 parts of acrylic-modified aqueous alkyd resin, 10-25 parts of aqueous epoxide resin, 10-25 parts of nano silica sol, 2-5 parts of amino resin, 2-5 parts of rutile-type titanium dioxide, 2-6 parts of nano calcium carbonate, 1-4 parts of nano titanium dioxide, 2-5 parts of aluminum oxide, 2-6 parts of nano ferric oxide, 0.1-0.5 part of nano silver, 0.3-1 part of polyethylene glycol, 0.1-0.5 part of proprylene glycol monomethyl ether, 0.2-1 part of ethylene glycol butyl ether, 0.5-1.5 parts of triethanolamine, 0.1-0.5 part of benzotriazole, 0.05-0.5 part of a dispersant, 0.1-0.8 part of a defoaming agent, 1-4 part of a dryer, 1-3 parts of a silane coupling agent and 20-50 parts of water. The modified aqueous alkyd resin, coating is high in hardness and excellent in impact resistance, water resistance, corrosion resistance and bacterium resistance.