NOVELTY - A self-crosslinking-type alkaline anion-exchange film contains exchange film material which is cross-linked block poly(arylene ether)alkaline ionomer (I).    USE - Self-crosslinking-type alkaline anion-exchange film is used as alkaline anion-exchange film of fuel cell (claimed).    ADVANTAGE - The self-crosslinking-type alkaline anion-exchange film having favorable ion conduction rate, chemical stability and mechanical property, and is prepared in a short period of time.    DETAILED DESCRIPTION - A self-crosslinking-type alkaline anion-exchange film contains exchange film material which is cross-linked block poly(arylene ether)alkaline ionomer of formula (I).    x=number of repeating units of hydrophilic segments, preferably 5-22;    y=number of repeating hydrophobic segment unit, preferably 8-20;    a=0.1-2;    n1,n2=3-15;    ring Ar1=group of formula (i)-(iii);    R=CH3, CH2N(CH3)3OH, CH2N(CH2CH3)3OH, or group of formula (x);and    ring Ar2=group of formula (iv)-(vi).    An INDEPENDENT CLAIM is included for preparation of self-crosslinking-type alkaline anion-exchange film, which involves dissolving multi-block poly (aryl ether)in polar solvent in a molar ratio of multi-block polyarylether, N-bromosuccinimide and azobis-iso-butyrynitrile of 1:(2-5):(0.1-0.25), reacting under protection of nitrogen at 80-85 degrees C for 2-6 hours, cooling, adding methanol, obtaining flocculent precipitate, washing the obtained precipitate using methanol for several times, vacuum drying, obtaining bromomethylated multi-block polyarylether, dissolving bromomethylated multi-block polyarylether in polar solvent, forming 7-10 wt.% solution, pouring obtained solution in a glass sheet, crosslinking in a vacuum drying box at 130-170 degrees C for 0.5-3 hours, obtaining crosslinked bromomethylated multi-block polyarylether, immersing obtained product in ionizing agent at room temperature for 24-48 hours, washing residue of ionization reagent using deionized water, obtaining ionized polyarylether film, immersing obtained film in alkali solution for 24-48 hours, washing using deionized water to until it is neutral, and obtaining crosslinked poly (arylene ether)-block-alkaline ionomer anion film having cross-linking degree of 2-10%. The multi-block poly (aryl ether) is of formula (II).    ring Ar1'=group of formula (vii)-(ix).