NOVELTY - A multilayer fluoro-crosslinking ion membrane comprises microporous membrane reinforcement and fluoro-crosslinking ion exchange resin to form the multilayer membrane containing 2-40 layers. The layer(s) have crosslinking netted texture, and comprise microporous membrane reinforcement. The fluoro-crosslinking ion exchange resin is prepared by copolymerizing fluoroolefin or fluoroolefin containing a functional group. The fluoroolefin can be hexafluoropropylene, poly (vinylidene fluoride), and/or preferably tetrafluoroethylene, chlorotrifluoroethylene (CTFE).    USE - A multilayer fluoro-crosslinking ion membrane.    ADVANTAGE - The ion exchange membrane has higher electroconductibility at high temperature, good size stability, and good mechanical strength.    DETAILED DESCRIPTION - A multilayer fluoro-crosslinking ion membrane comprises microporous membrane reinforcement and fluoro-crosslinking ion exchange resin having an equivalent eight value of 600-1300to form the multilayer membrane containing 2-40 layers. The layer(s) have crosslinking netted texture, and comprise microporous membrane reinforcement. The ion membrane has electroconductibility of 40-150 mS/cm, tensile-strength of 10-60 MPa, and total thickness of 10-300 mu m. The fluoro-crosslinking ion exchange resin is prepared by copolymerizing fluoroolefin or fluoroolefin containing a functional group. The fluoroolefin can be hexafluoropropylene, poly (vinylidene fluoride), and/or preferably tetrafluoroethylene, CTFE. The fluoroolefin having functional group can be of formula Y'1(CF2)a(CFRf1)b(CFRf2)c-O(C(CF2X)FCF2O)n-CF=CF2, Rf3CF=CF(CF2)dY'2, and/or F2C=CFOCF2C(CF2OCF3)FOCF2CF2Y'3, or preferably F2C=CFRf4Y'4 or Y'5(CF2)a'(CFRf5)b'(CFRf6)c'O(C(CF2X1)FCF2O)n'-CF=CF2.    a, b, c, d=0-5=0 or 1;    X=F, Cl, Br or I;    Rf1, Rf2, Rf3=perfluoroalkyl or chlorofluoroalkyl;    Y'1, Y'2, Y'3=SO2M, COOR3 or PO(OR4)(OR5);    M=Br, F, Cl, OR or NR1R2;    R=Me, ethyl or propyl, H, Na, Li, K or NH3;    R1, R2=H, Me, Et or propyl;    R3=H, Na, Li, K, NH3, Me, Et or propyl;    R4, R5=H, Na, Li, K, NH3, Me, Et, or propyl;    Y'4, Y'5=Cl, Br, I or CN;    a', b', c'=0 or 1; or    a'+ b'+ c'=not equal to 0;    X1=F, Cl, Br, I, SO2F, SO2Cl, SO2Br or CN;    n'=0 or 1;    Rf4, Rf5, Rf6=perfluoroalkyl or chlorofluoroalkyl.    Provided that a, b and c cannot be 0 at the same time. An INDEPENDENT CLAIM is included for a method for preparing a multilayer fluoro-crosslinking ion membrane, comprising preparing each layer of multilayer of fluorinated ion exchange membranes with enhanced micro-porous membrane; compounding signal layer membranes to prepare the multilayer membrane; adding cross linker and/or evocating agent when preparing the multilayer of fluorinated ion exchange membranes; processing the membrane to form cross-linked structures and treating formed product via soda solution and acidic liquor to obtain fluoro-crosslinking ion exchange membrane with reinforced microporous membrane.