The invention discloses an antibacterial metal surface treatment agent. Acrylate glue liquid particles contain a lot of carboxyl on the surfaces, aniline is added into the acrylate glue liquid, and an aniline monomer is firstly diffused into a micelle, then is doped with carboxyl and is polymerized with emulsion particles on the surface under the effect of an oxidizing agent, so that the contact angle of a polyaniline coating to water is increased, and the adhesive force and water resistance are improved. The coating can enable surface passivation of a metal to play a protecting role through an electron transfer effect and an oxidation-reduction effect. For fluotitanic acid through silylation modification, an introduced inorganic component Ti4<+> forms TiO2 particles in a heating and curing process and the TiO2 particles are uniformly filled in gaps of a silane film, so that the whole film layer is more uniform and compact. The micro-electrochemical reaction on the surface of the film layer can be effectively inhibited, so that the corrosion resistance is greatly improved.