The invention discloses a room temperature self-crosslinking acrylic ester emulsion. The emulsion comprises deionized water, an initiator, an emulsifier, a vinyl aromatic compound, carboxyl-containing olefin monomers, alkyl acrylate unsaturated monomers of C4-C12, methacrylate unsaturated monomers of C4-C20 and functional monomers. The emulsion is prepared with an emulsion polymerization method by adding a pH regulator, a curing agent and a metallic cross linker. The emulsion has the advantages of high glossiness, good abrasive resistance, water resistance and alcohol resistance, has good dryness under high humidity, can be applied to different coating fields and is also suitable for floor wax formulas of polishing-free wax, spray cleaning, cleaning wax polish and the like. The emulsion can be applied to various rigid base materials such as PVC (Polyvinyl Chloride), boards and composite boards and has good balance between detergent resistance and removability.