NOVELTY - Solar energy battery packaging film comprises a weather-proof layer and a polyester layer. The polyester layer is composited with weather-proof layer through coating adhesive bonding layer. The weather-proof layer is a fluorine-containing material layer made by mixing fluoroplastic and an inorganic filler with functional additives, extruding and granulating, casting or film blowing to obtain fluorine-containing film. The fluoroplastic is modified vinyl fluoride resin. The inorganic filler is nano-grade particles of oxides of titanium, aluminum, tin or silicon.    USE - Used as solar energy battery packaging film.    ADVANTAGE - The solar energy battery packaging film has excellent performance and compact backplane membrane structure and is economical.    DETAILED DESCRIPTION - Solar energy battery packaging film comprises a weather-proof layer and a polyester layer. The polyester layer is composited with weather-proof layer through coating adhesive bonding layer. The weather-proof layer is a fluorine-containing material layer made by mixing fluoroplastic and an inorganic filler with functional additives, extruding and granulating, casting or film blowing to obtain fluorine-containing film. The fluoroplastic is modified vinyl fluoride resin, which accounts for 70-90% of weather-proof layer weight. The inorganic filler is nano-grade particles of oxides of titanium, aluminum, tin or silicon, which accounts for 10-30% of weather-proof layer weight. The functional auxiliary agent accounts for 0-2% of weather-proof layer weight. The fluoroplastic is modified vinyl fluoride resin of formula (-(CFH-CH2)a-(CF2-C(X)(Y1))b-(CF2-CF(R1))c-(CH2-CH2)d-) (I) obtained by copolymerizing fluoroethylene, ethylene, substituted fluoroethylene compound of formula (CF2=CXY1) (II), perfluoroalkyl or perfluoroalkoxy fluoroethylene compound of formula (CF2=CFR1) (III).    X, Y1 = H, F or Cl;    R1 = perfluoroalkyl group or perfluoroalkoxy;    a = fluoroethylene content (60-95 mole%, preferably 65-80 mole%);    d = ethylene content (1-15 mole%, preferably 3-10 mole%);    b = substituted fluoroethylene content (0-30 mole%, preferably 3-15 mole%); and    c = perfluoroalkyl or perfluoroalkoxy fluoroethylene content (0-15 mole%, preferably is 3-10 mole%).    An INDEPENDENT CLAIM is also included for preparing the solar energy battery packaging film, comprising (i) uniformly mixing weather-proof layer components according to proportion, extruding and granulating by twin screw extruder, performing casting or film blowing extrusion of the mixed material to form weather-proof layer; (ii) surface treating weather-proof layer by corona, plasma or flame treatment; and (iii) uniformly coating the adhesive on both sides of polyester base film, adhering the weather-proof layer on the base film sides, rolling and curing to obtain solar energy battery packaging film with composite structure.