NOVELTY - Fluorine-containing resin comprises 70-81 mass% of a plasticizer, 2-3.5 mass% of a stabilizing agent, 0.5-3 mass% of a coupling agent, 0.5-4 mass% of an antioxidant, and 1-5 mass% of a filling agent. The plasticizer is dibutyl phthalate, triacetin, sulfolane or propylene carbonate. The stabilizing agent is 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-benzotriazole or 2-(2'-hydroxy-3',5'-ditert butylphenyl)benzotriazole. The resin has a melting point of 150-170 degrees C, and a degree of crystallinity of 29-40%.    USE - The fluorine-containing resin is useful for photovoltaic film (claimed).    DETAILED DESCRIPTION - Fluorine-containing resin comprises 70-81 mass% of a plasticizer, 2-3.5 mass% of a stabilizing agent, 0.5-3 mass% of a coupling agent, 0.5-4 mass% of an antioxidant, and 1-5 mass% of a filling agent. The plasticizer is dibutyl phthalate, triacetin, sulfolane or propylene carbonate. The stabilizing agent is 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-benzotriazole, 2-(2'-hydroxy-3',5'-ditert butylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-bis tert-butyl-phenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-bis(1,1-dimethyl-propyl-phenyl))-2H-benzotriazole or bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate. The coupling agent is bis-2,2,6,6-tetramethyl piperidine ester, 2-hydroxy-4-octyloxy benzophenone. The coupling agent is silane coupling agent or titanic acid ester coupling agent of formula (ROO(4-n)Ti(OX-R1a-Y1)n). The resin has a melting point of 150-170 degrees C and a degree of crystallinity of 29-40%.    R1a = silicon dioxide powder, quartz powder, calcium carbonate powder, talcum powder, micarex powder, or titanium pigment;    X = carboxyl, alkoxy, sulfonic acid or phosphorus; and    n = 2, 3.    N.B. Y1 is not defined. An INDEPENDENT CLAIM is included for preparing the fluorine-containing resin comprising taking the fluorine-containing resin, uniformly mixing, placing a double-screw or single-screw extruding pelleting machine, cutting and granulating, and extruding to obtain the modified fluorine-containing resin.