A multifunctional base film developed according to various wall characteristics. Multiple protection, effectively developed for the problems of single, multiple and composite wall foundations in wall construction. It has the characteristics of thick film formation, high hardness, good sealing, alkali and moisture resistance, etc. It forms an effective sealing protective film on the wall and the base of the wall, strengthens the microcirculation in the wall, tightens the dense wall, and relieves the penetration of moisture and alkaline substances to extend the life cycle of wallpaper and wall coverings.