NOVELTY - Preparation of alkaline polymer electrolyte film comprises: (a) dissolving polyvinyl alcohol in 70-90% of dimethyl sulfoxide solvent or water, dissolving poly(epichlorohydrin) in 70-90% of dimethyl sulfoxide solvent or water; (b) mixing polyvinyl alcohol and poly(epichlorohydrin) polymer solutions; (c) coating the admixed polymer mucus on glass plate; (d) placing the glass plate or culture dish in environment at 30-70 degrees C and 5-30% relative humidity; and (e) immersing the formed polymer film in aqueous solution of alkali metal hydroxide to obtain alkaline solid polymer electrolyte film.    USE - The process is useful for preparing alkaline polymer electrolyte film (claimed). The prepared alkaline polymer electrolyte film is useful for zinc-air cell.    ADVANTAGE - The ion conductivity of alkaline polymer electrolyte film of this invention can reach to more than 0.01 siemens (s)/cm at normal temperature and high temperature. Moreover, it also has high conductivity and electrochemical stability.    DETAILED DESCRIPTION - Preparation of alkaline polymer electrolyte film comprises: (a) dissolving polyvinyl alcohol in 70-90% of dimethyl sulfoxide solvent or water, dissolving poly(epichlorohydrin) in 70-90% of dimethyl sulfoxide solvent or water; (b) mixing polyvinyl alcohol and poly(epichlorohydrin) polymer solutions at 40-80 degrees C, and stirring to take admixture reaction; (c) coating the admixed polymer mucus on glass plate, controlling thickness of needed wet film, or pouring the polymer solution to culture dish, and controlling and pouring proper polymer mucus according to the needed film thickness; (d) placing the glass plate or culture dish in environment at 30-70 degrees C and 5-30% relative humidity (RH) to dry at constant temperature and constant humidity, and vaporizing all solvent to obtained formed film; and (e) immersing the formed polymer film in aqueous solution of alkali metal hydroxide to obtain alkaline solid polymer electrolyte film.