NOVELTY - Solar battery back film comprises an overlapped basal layer, a middle layer and a weather resistant layer. The basal layer and the middle layer are laminated via a rubber layer. The weather resistant layer is coated on the middle layer. The basal layer is a metal layer or a plated compound layer. The plated compound layer is polyester plated silicon, aluminum oxide or silicon oxide. The middle layer is polyethylene terephthalate layer. The weather resistant layer includes fluorocarbon resin, fluoro-organic polysiloxane, a cross-linking agent and an inorganic filler.    USE - Used as a solar battery back film.    ADVANTAGE - The solar back film: has low water gas transmission rate, good waterproof performance and good combined force between layers; avoids the separation of layers; and increases the service life of the battery.    DETAILED DESCRIPTION - Solar battery back film comprises an overlapped basal layer, a middle layer and a weather resistant layer. The basal layer and the middle layer are laminated via a rubber layer. The weather resistant layer is coated on the middle layer. The basal layer is a metal layer or a plated compound layer. The plated compound layer is a polyester plated silicon, aluminum oxide of formula (AlOx) or silicon oxide of formula (SiOy). The middle layer is polyethylene terephthalate layer. The weather resistant layer includes fluorocarbon resin, fluoro-organic polysiloxane, a cross-linking agent and an inorganic filler.    x = 4/3-3/2; and    y = 0-2.    INDEPENDENT CLAIMS are also included for:    (1) preparing the solar battery back film, comprising: (i) processing the surface of middle layer, coating the slurry on one surface of the middle layer to form a coating, where the slurry is a mixture of fluorocarbon resin, fluoro-organic polysiloxane, cross-linking agent, inorganic filler and a solvent, (ii) cross-linking and curing the coating at 50-150 degrees C to form a weather resistant layer, and (iii) overlapping the other surface of the middle layer with the basal layer, laminating and bonding; and    (2) a solar battery, comprising an overlapped light transmission layer, rubber layer, battery sheet and the solar battery back film.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the solar battery back film.