TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The silane coupling agent is vinyl trimethoxy silane. The inorganic filler is nano-titanium dioxide, silica or aluminum oxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The cross-linking catalyst is dibutyltin dilaurate. The lubricant is stearic acid, butyl stearate, ethylene bis(stearamide), natural wax, synthetic wax, polyethylene wax and/or polypropylene wax. The antioxidant is antioxidant 1010, antioxidant 1076 or antioxidant (butylated hydroxytoluene). The light stabilizer is light stabilizer 770 or light stabilizer 622LD. The light absorbent is light absorbent UV-P or light absorbent UV-O. The organic peroxide is dicumyl peroxide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The ethylene-chlorotrifluoroethylene copolymer is copolymer of ethylene, chlorotrifluoroethylene and fluorine-containing vinylmonomer, where the molar ratio of ethylene to chlorotrifluoroethylene in the copolymer is 40-60:40-60, the total content of ethylene and chlorotrifluoroethylene in the copolymer is 90-99.9% and the content of fluorine-containing vinyl monomer in the copolymer is 0.1-10%. The fluorine-containing vinyl monomer is perfluoroisopropoxybutylethylene, fluoroalkyl ethylene, perfluoro n-propyl vinyl ether, perfluoroalkyl ethylene compound of formula (CH2=CH-Rf1), perfluoroalkyl difluoroethyene compound of formula (CF2=CH-Rf1), perfluoroalkyl fluoroethyene compound of formula (CH2=CF-Rf1), perfluoroalkyl fluoroethyene compound of formula (CHF=CF2-Rf1) or perfluoroalkoxy fluoroethyene compound of formula (CHF=CF2-O-Rf1). The modified resin is polymethyl methacrylate. The low-fluorine solar battery protective film comprises 40-50 pts. wt. ethylene-chlorotrifluoroethylene copolymer, 0.1-0.3 wt.% dicumyl peroxide, 1.5-2.5 wt.% vinyltrimethoxysilane, 0.1-0.4 wt.% dibutyltin dilaurate, 10-40 pts. wt. titanium dioxide, 10-30 pts. wt. polymethyl methacrylate, 0.1-1 pts. wt. lubricant, and 0.5-2 pts. wt. functional auxiliary agent. The fluorine-containing film has a thickness of 20-40 mu m.Rf1 = 2-10C perfluoroalkyl.