NOVELTY - A fluorine-containing cross-linked film comprises ion film having 2-40 layers made of fluorine-containing ion-exchange resin. The ion film has a total thickness of 10-300 microns, and is provided with a cross-linked net structure. A layer of film is added to an inorganic dopant with water holding function or proton-exchange function. The fluorine-ion-containing exchange resin is formed by copolymerizing fluorine-containing olefin, fluorine-containing alkene monomer with functional groups and one or multiple fluorine-containing alkene monomers with cross-linked sites or their mixture.    USE - Fluorine-containing cross-linked film for manufacturing fuel cell.    ADVANTAGE - The fluorine-containing cross-linked film ensures improved mechanical strength and stability in directions of length, width and thickness, high ion exchange capacity and electric conductivity.    DETAILED DESCRIPTION - A fluorine-containing cross-linked film comprises ion film having 2-40 layers made of fluorine-containing ion-exchange resin. The ion film has a total thickness of 10-300 microns, and is provided with a cross-linked net structure. A layer of film is added to an inorganic dopant with water holding function or proton-exchange function. The cross-linked net structure is represented by general formula (I). The fluorine-ion-containing exchange resin is formed by copolymerizing fluorine-containing olefin, one or multiple fluorine-containing alkene monomers with functional groups and one or multiple fluorine-containing alkene monomers with cross-linked sites or their mixture. The fluorine-containing olefin is selected from tetrafluoroethylene, trifluorochloroethylene, trifluoroethylene, hexafluoropropene or vinylidene fluoride. The fluorine-containing alkene monomer with functional groups has general formulae (II-IV). The fluorine-containing alkene monomer with crosslink sites has general formulae (V-VI). Y1(CF2)a(CFRf1)b(CFRf2)cO(C(CF2X)FCF2O)nCF=CF (II) Rf3CF=CF(CF2)dY2 (III) CF2=CFOCF2C(CF2OCF3)FOCF2CF2Y3 (IV) CF2=CFRf4Y4 (V) Y5(CF2)a'(CFRf5)b'(CFRf6)c'O(CFCF2O)n'-CF=CF2 (VI)    G1 and G2=CF2 or O;    Rf=2-10C perfluorinated carbon-chain or chlorine-containing perfluorinated carbon-chain;    a,b,c,a',b' and c'=0-1;    n and n'=0-1;    X and X1=F, Cl, Br or I;    d=0-5;    Rf1 to Rf3=perfluoroalkyl or chlorofluoroalkyl;    Y1 to Y3=SO2M, COOR3 or PO(OR4)(OR5);    M=Br, F, Cl, -OR or NR1R2;    R=methyl, ethyl or propyl;    R3=H, Na, Li, K, ammonium group, methyl, ethyl or propyl group;    R4 and R5=H, Na, Li, K, ammonium group, methyl, ethyl or propyl group;    Y4 and Y5=Cl, Br, I or CN; and    Rf4 to Rf6=perfluoroalkyl.    An INDEPENDENT CLAIM is included for a method for producing fluorine-containing cross-linked film.