NOVELTY - A backplate material for solar battery assembly comprises a bottom coating with high bonding strength of ethylene vinyl acetate, two fluorine-containing resin weathering coating membranes, and a middle polymer basal membrane located between the two fluorine-containing resin weathering coating membranes; where one fluorine-containing resin weathering coating membrane has high light reflecting performance; and the bottom coating and the fluorine-containing resin weathering coating membrane are close to one side of the battery sheet in the battery assembly package.    USE - The backplate material is useful for solar battery assembly (claimed).    ADVANTAGE - In the backplate material for solar battery assembly, the fluorine-containing resin coating liquid has good coating uniformity, has good adhesive force along with the polymer, and contains stuff constituents with high reflecting rate.    DETAILED DESCRIPTION - A backplate material for solar battery assembly comprises a bottom coating with high bonding strength of ethylene vinyl acetate (EVA), two fluorine-containing resin weathering coating membranes, and a middle polymer basal membrane located between the two fluorine-containing resin weathering coating membranes; where one fluorine-containing resin weathering coating membrane has high light reflecting performance, and the bottom coating with high bonding strength of EVA in the coating membrane and the fluorine-containing resin weathering coating membrane with high light reflecting performance are close to one side of the battery sheet in the battery assembly package; the fluorine-containing resin coating liquid has good coating uniformity, has good adhesive force along with the polymer, and contains stuff constituents with high reflecting rate comprising 100 pts.wt. of fluorine-containing resin, 3-20 pts.wt. of curing agent, 10-30 pts.wt. of high reflecting stuff, 0.0003-0.001 pts.wt. of catalyst, and 50-200 pts.wt. of solvent; the fluorine-containing resin is polyvinylidene fluoride (PVDF), fluoro-olefin vinyl ether (FEVE), or fluorinated ethylene propylene (FEP) resin; the trifluorine-containing resin is vinyl fluoride-vinyl ether or ester copolymer; the tetrafluorine-containing resin is tetrafluoroethylene and alkyl vinyl ether copolymer or tetrafluoroethylene and alkyl vinyl ester copolymer; and the polymer basal membrane material is polyamide (PA), polymethyl methacrylate (PMMA), polyethylene glycol terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephalate (PTT), polycyclohexylene dimethylene terephthalate (PCT), polystyrene (PS), polyethylene naphthalene (PEN), or their mixture.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the backplate material for solar battery assembly.