NOVELTY - A fluorine-containing high polymer proton exchange membrane comprises cation-exchange membrane containing cation-exchange-type fluorine-containing ion exchange resin. A portion of cation exchange group in the fluorine-containing ion exchange resin ion-exchanges with cerium or manganese ion to form modified fluorine-containing ion exchange resin containing cerium or manganese ion. The fluorine-containing ion exchange resin is obtained by copolymerizing tetrafluoroethylene, ethylene and alkene monomer (I).    USE - Fluorine-containing high-polymer proton exchange membrane is used for fuel cell.    ADVANTAGE - The fluorine-containing high-polymer proton exchange membrane has excellent proton conductivity and durability, and has smooth surface.    DETAILED DESCRIPTION - A fluorine-containing high polymer proton exchange membrane comprises cation-exchange membrane containing cation-exchange-type fluorine-containing ion exchange resin. A portion of cation exchange group in the fluorine-containing ion exchange resin ion-exchanges with cerium or manganese ion to form modified fluorine-containing ion exchange resin containing cerium or manganese ion. The content of cerium or manganese ion is 1-20 mol% with respect to weight of cation exchange group in fluorine-containing ion exchange resin. The fluorine-containing ion exchange resin is obtained by copolymerizing tetrafluoroethylene, ethylene and alkene monomer of formula: A-(CF2)a-(C(-Rf)F)b-C(-R')F-O-(C(-CF3)F-CF2-O)n-CF=CF2 (I). The content of tetrafluoroethylene in the fluorine-containing ion exchange resin is 30-69.9 mol%. The content of ethylene in the fluorine-containing ion exchange resin is 60-30 mol%. The content of alkene monomer (I) in the fluorine-containing ion exchange resin is 0.1-10 mol%. The fluorine-containing ion exchange resin has ion exchange capacity of 0.5-1.6 mmol/g.    a,b=0-5;    a+b=integer other than 0;    n=0-2;    Rf,R'=-F, -Cl, -Br or -CzF2z+1;    z=1-5;    A=-SO2F, -SO2Cl, -SO2Br or -SO2NR1R2;    R1,R2=-H or CmH2m+1;and    m=1-10.    An INDEPENDENT CLAIM is included for preparation of fluorine-containing high polymer proton exchange membrane, which involves soaking fluorine-containing sulfonic acid resin in solution containing cerium or manganese ion, stirring mixture at room temperature for 40-48 hours, washing resin by pure water, drying at 120-200 degrees C in oven to obtain fluorine-containing sulfonic acid cerium resin or fluorine-containing sulfonic acid manganese resin, dissolving fluorine-containing sulfonic acid cerium resin or fluorine-containing sulfonic acid manganese resin in solvent to obtain solution having concentration of 5-30 %mass, preparing proton exchange membrane using the obtained solution by casting, spraying, pouring or spinning, or melt-extruding the solution.