The invention relates to an aqueous adhesive, an anti-scratching wearing-resistant PVC (Polyvinyl Chloride) weather-resistant membrane and a preparation method thereof. The aqueous adhesive comprises the following components in parts by mass: 50-70 parts of polycarbonate polyurethane resin, 30-40 parts of a fluorine-carbon acrylate emulsion, 3-5 parts of a self-emulsifying polyisocyanate curing agent, 5-10 parts of an aqueous high-density polyethylene wax emulsion, 1-3 parts of alcohol amine titanate, 3-6 parts of an aqueous nano zinc oxide dispersion and 2-hydroxyl-4-n-octanoyl benzophenone mixed liquid, 3-5 parts of a high molecular weight polydimethyl siloxane dispersion and 20-30 parts of deionized water. The PVC membrane is adopted as a surface layer material, the surface is coated by a functional coating with ultraviolet radiation and starch resistant effects, and the coating has good binding force with the PVC membrane and has good ultraviolet radiation and starch resistant effects, so that the properties of a PVC product can be improved, and the service life of the PVC product can be prolonged.