Through special deep processing of EPS polystyrene board, glass fiber mesh cloth is pasted on the surface of EPS board, and two layers of special protective surface layer are added to permanently protect EPS board from temperature changes, humid climate and acid rain, as well as expansion and contraction. It replaces the traditional decorative lines made of cement and glass fiber, and is especially used in the building exterior wall decoration system of EPS board wall external insulation, thereby effectively avoiding the problem of cold and thermal bridges on the exterior wall of the main building.