A baking type water-based automobile finishing varnish having acid resistance comprising a component A and a component B, a mass ratio of the component A to the component B being 1-4: 1, wherein component A comprises 20-30 wt. % of a methacrylate monomer, 35-45 wt. % of an acrylate monomer, 5-15 wt. % of a non-acrylate monomer, 5-15 wt. % of an acrylic monomer, 10-20 wt. % of a hydroxyl-containing acrylate monomer and 0.5-1.5 wt. % of a chain transfer agent, component B comprises 5-15 wt. % of the methacrylate monomer, 35-45 wt. % of the acrylate monomer, 5-15 wt. % of the non-acrylate monomer, 5-15 wt. % of the acrylic monomer, 25-35 wt. % of the hydroxyl-containing acrylate monomer and 0.5-1.5 wt. % of the chain transfer agent, the methacrylate monomer is selected from the group consisting of methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, isobutyl methacrylate and t-butyl methacrylate, the acrylate monomer is selected from the group consisting of butyl acrylate, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-propyl acrylate,2-ethylhexyl acrylate and isobutyl acrylate, the non-acrylate monomer is styrene or vinyl acetate, the acrylic monomer is selected from the group consisting of acrylic acid, methacrylic acid and itaconic acid, the hydroxyl-containing acrylate monomer is selected from the group consisting of β-hydroxyethyl acrylate, β- hydroxypropyl acrylate, β-hydroxyethyl methacrylate and β- hydroxypropyl methacrylate and the chain transfer agent is selected from the group consisting of dodecyl mercaptan, n-butyl mercaptan, tert-butyl mercaptan, carbon tetrabromide, n-butyl sulfide, isopropylbenzene, β-naphthalenethiol and carbon tetrachloride. component A comprises 20-30 wt. % of a methacrylate monomer, 35-45 wt. % of an acrylate monomer, 5-15 wt. % of a non-acrylate monomer, 5-15 wt. % of an acrylic monomer, 10-20 wt. % of a hydroxyl-containing acrylate monomer and 0.5-1.5 wt. % of a chain transfer agent, component B comprises 5-15 wt. % of the methacrylate monomer, 35-45 wt. % of the acrylate monomer, 5-15 wt. % of the non-acrylate monomer, 5-15 wt. % of the acrylic monomer, 25-35 wt. % of the hydroxyl-containing acrylate monomer and 0.5-1.5 wt. % of the chain transfer agent, the methacrylate monomer is selected from the group consisting of methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, isobutyl methacrylate and t-butyl methacrylate, the acrylate monomer is selected from the group consisting of butyl acrylate, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-propyl acrylate,2-ethylhexyl acrylate and isobutyl acrylate, the non-acrylate monomer is styrene or vinyl acetate, the acrylic monomer is selected from the group consisting of acrylic acid, methacrylic acid and itaconic acid, the hydroxyl-containing acrylate monomer is selected from the group consisting of β-hydroxyethyl acrylate, β- hydroxypropyl acrylate, β-hydroxyethyl methacrylate and β- hydroxypropyl methacrylate and the chain transfer agent is selected from the group consisting of dodecyl mercaptan, n-butyl mercaptan, tert-butyl mercaptan, carbon tetrabromide, n-butyl sulfide, isopropylbenzene, β-naphthalenethiol and carbon tetrachloride.