NOVELTY - An aromatic polymer ionic liquid diaphragm material comprises cation and anion. The cation is a compound organically combined by hydrogen ion or metal ion and organic molecule. The anion is fluorine-containing sulfoacid anion on side wall of a polymer containing aromatic benzene ring, or fluorine-containing sulfimide anion.    USE - Aromatic polymer ionic liquid diaphragm material used for lithium ion battery, secondary lithium ion battery, methanol fuel battery, liquid flow battery, or in electroosmosis water treatment, atomic energy industry, analytical and catalytic synthesis, or chlor-alkali industry.    ADVANTAGE - The diaphragm material comprises ionic liquid which does not easily runoff and which is highly-conductive such that its conductivity does not rely on water. The material can prevent hydroxide (OH-) anion, methanol or vanadium ion from passing through, and can form an ion channel which has strong ion activity, high chemical stability, low ion activating energy and easy absorption of polar solvent.    DETAILED DESCRIPTION - An aromatic polymer ionic liquid diaphragm material comprises cation and anion. The cation is a compound organically combined by hydrogen ion or metal ion and organic molecule. The anion is fluorine-containing sulfoacid anion on side wall of a high polymer containing aromatic benzene ring, or fluorine-containing sulfimide anion. The high polymer is formula of -((Ar')Rf'SO3)n- or -((Ar')Rf'-SO2NSO2Rf'')n-.    -(Ar')=high polymer material containing aromatic radical;    Rf'=-CnF2n- or -(CF2CF2)nOCF2CF2-;    Rf''=ZCnF2n-;    Z=H+, F-, or Cl-; and    n=1-40.    An INDEPENDENT CLAIM is included for preparation of the diaphragm material, comprising:    (A) synthesizing fluorine-containing sulfoacid radical active intermediate of formula XRf'SO3M or synthesizing fluorine-containing sulfimide active intermediate of formula XRf'SO2NMSO2Rf'';    (B) connecting active intermediate with side chain of polymer containing aromatic benzene ring through coupling reaction in presence of metal to generate polyelectrolyte high polymer material of fluorine-containing sulfoacid radical or fluorine-containing sulfimide anion;    (C) processing ion exchange or neutralization reaction on the polyelectrolyte high polymer material to generate ionic polymer liquid containing cation and fluorine-containing sulfoacid ion or fluorine-containing sulfimide anion; and    (D) allowing the ionic liquid to form film to obtain the ionic liquid diaphragm material.    X=I- or Br-; and    M=metal element.