NOVELTY - The backboard has a weather-proof layer, a structure reinforcing layer and an adhesive reflection layer that are adhered in a sequence, where the adhesive reflection layer is a polypropylene layer. The polypropylene layer is formed by mixing and modifying a plastic containing propylene segment, a plastic containing ethylene segment, an anti-UV stabilizer, a thermal oxidative aging resisting stabilizer and an inorganic white dye. Melting point of the polypropylene layer is greater than 120 degrees centigrade. The inorganic white dye is titanium powder or barium sulfate.    USE - Solar battery backboard.    ADVANTAGE - The backboard is capable of executing heat-resistant process. The backboard can be executed with heat-resistant process. The cost is lower than the double-layer fluorine structure backboard. The backboard has better performance. The backboard meets the request of the solar battery backboard, and plays an important role in solar industry.    DETAILED DESCRIPTION - The plastic containing propylene segment is selected from one of even polymer polypropylene or polymer polypropylene or copolymer of propylene-ethylene. The plastic containing ethylene segment is selected from one of polymer polypropylene, polyethylene copolymer of propylene-ethylene, ethylene-vinyl acetate resin, ethylene-butyl acrylate or methyl ester resin or ethylene-acrylic ester-maleic acid resin. The weather-proof layer is a fluorine material alley layer. The fluorine material alley layer is a blended plastic alley layer of a fluorine material layer or inorganic material. The fluorine material is selected from one of polyvinyl fluoride, kynoar polyvinylidene fluoride, ethylene-trifluorochloroethylene copolymer, ethylene-tetrafluoroethylene copolymer, tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride, copolymers of fluoroethylene or vinyl ether. The inorganic material is made of combination from silicon, magnesium, titanium, zinc, aluminum, molybdenum or barium, oxygen or sulfate radical. The inorganic substance comprises silicon dioxide, titanium dioxide, aluminum oxide and molybdenum sulfide, comprises silicon dioxide, zinc sulfide and titanium dioxide or comprises titanium dioxide, zinc sulfide and barium sulfate. The structure reinforcing layer is a polyethylene glycol terephthalate layer, where the polyethylene glycol terephthalate layer is a double bi-directional tension polyethylene glycol terephthalate layer. The adhesive layers are any one of polyurethane rubber layer, polyurethane rubber layer or epoxy rubber layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a solar battery backboard.