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The application provides a coating liquid system for improving the durability of gold and silver threads and an application thereof, and comprises a foaming type primer liquid used for foaming a coating; a atomizing type transition coating liquid used for atomizing the coating; and a long-acting protection type coating liquid, wherein the long-acting protection type coating liquid at least comprises a compound type high molecular resin emulsion, a mesoporous silica loaded with benzotriazole and an epoxy group modified barium sulfate, and the compound type high molecular resin emulsion is a compound mixed solution of a carboxyl acrylate emulsion, N-hydroxymethyl acrylamide, polyvinyl alcohol and a polyurethane emulsion. The compound mixed solution can solve the protection problem of the exposed cross section after slitting without affecting the size precision, production efficiency and decoration performance of the gold and silver threads.