NOVELTY - A solar battery backboard film comprises weather-proof layer (10-20 wt.%) and polyester layer, where polyester layer has a coating of adhesive bonding layer and weather resistance layer (50-80 wt.%) on two sides, and where the weather resistance layer is fluorine-containing material layer which is formed by mixing fluorine plastic and polymer stuffing, inorganic filler and auxiliary agent (0-2 wt.%), extruding granulating then through casting or film blowing the fluorine-containing film, where fluorine plastic is ethylene chlorotrifluoroethylene copolymer or polyvinylidene fluoride.    USE - As solar battery backboard (claimed).    ADVANTAGE - The solar battery backboard weatherable film layer and the packaging material has good adhesiveness, and the back board of film the structure is compact. The production process is simple with low cost.    DETAILED DESCRIPTION - A solar battery backboard film comprises weather-proof layer (10-20 wt.%) and polyester layer, where the polyester layer has a coating of adhesive bonding layer and weather resistance layer (50-80 wt.%) on two sides, and where the weather resistance layer is fluorine-containing material layer which is formed by mixing fluorine plastic and polymer stuffing, inorganic filler and auxiliary agent (0-2 wt.%), extruding granulating then through casting or film blowing the fluorine-containing film, where the fluorine plastic is ethylene chlorotrifluoroethylene copolymer or polyvinylidene fluoride. The polymer stuffing is polyacrylate polymer (10-30 wt.%). The inorganic filler is nano-grade oxide containing titanium, aluminum, tin or silicon particle. An INDEPENDENT CLAIM is included for preparation of the backboard complex film involving: mixing the weatherable layer each component according to proportion, extruding and granulating by the twin screw extruder, to make each component is uniformly mixed to together pass through; mixing the combined material to carry out extrusion casting or film blowing, weather-proof thin film; coating uniformly through glue adhesive on the polyester base film side; and then product of first step is adhered to the base film side of the rolling gel to obtain a weather-proof, adhesive bonding layer, polyester base layer, adhesive bonding layer, weather-proof composite structure of the back film product.