NOVELTY - Preparation of polymer basic anion exchange film comprises adding polymer powder into plasma discharge area and generating free radical on surface of polymer powder by plasma bombardment, adding into chloromethyl styrene, heating at 40-80 degrees C and stirring; centrifuging and filtering mixture produced in reaction, washing, soaking mixture in deionized water repeatedly, performing cast coating to form a film, and drying; and immersing dried film in trimethylamine aqueous solution, taking out quaternized film, and washing with deionized water repeatedly.    USE - Method for preparation of polymer basic anion exchange film (claimed) used for polymer electrolyte fuel cells, i.e. basic direct alcohol fuel cells.    ADVANTAGE - The method is non-toxic, causes no pollution to environment and does not damage polymer frame. The anion exchange film is good in thermal stability, chemical stability, electron exchange capacity and ionic conductivity.    DETAILED DESCRIPTION - Preparation of polymer basic anion exchange film comprises:    (A) adding polymer powder into plasma discharge area and generating free radical on surface of polymer powder by plasma bombardment with plasma discharge treatment performed for 10-60 minutes, and plasma power density of 50-300 W/L;    (B) adding plasma-treated plasma powder into chloromethyl styrene at 2-6 times the weight of the powder, heating at 40-80 degrees C and stirring for 12-75 hours to introduce chlorobenzyl group onto polymer powder;    (C) centrifuging and filtering mixture produced in reaction, washing, soaking mixture in deionized water repeatedly, drying mixture, dissolving dried powder in solvent to prepare solution having a concentration by weight of 0.1-20%, performing cast coating to form a film, and drying the film;and    (D) immersing dried film in trimethylamine aqueous solution, reacting for 12-48 hours at room temperature, taking out quaternized film, washing film with deionized water repeatedly, soaking film in 1-2 mol/L aqueous alkali for 12-60 hours, taking out alkalized film, washing and soaking film with deionized water to obtain basic anion exchange film.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the preparation of polymer basic anion exchange film. (Drawing includes non-English language text)