NOVELTY - A direct methanol fuel cell is manufactured by reacting polyether-ether-ketone and sulfuric acid; dissolving sulfonated polyether-ether-ketone into organic solvent; adding N,N'-carbonyldiimidazole; adding coupling agent to obtain reaction solution of sulfonated polyether-ether-ketone; reacting with inorganic crosslinking agent and then adding proton conductor; utilizing proton exchange membrane with mixed solution of sulfonated polyether-ether-ketone/inorganic crosslinking agent/proton conductor, membrane-forming, drying and then membrane-removing to obtain the cell.    USE - For manufacturing direct methanol fuel cell.    ADVANTAGE - The fuel cell has good alcohol resistance, low cost, high proton conductivity and good resistance for swelling capacity of water at higher temperature. The method is simple, has low cost of raw material and has low production cost.    DETAILED DESCRIPTION - A direct methanol fuel cell is manufactured by:    (A) reacting polyether-ether-ketone (1 pbw) and 95-98% sulfuric acid (35-75 pbw), diluting, filtering and drying to obtain sulfonated polyether-ether-ketone;    (B) dissolving sulfonated polyether-ether-ketone into organic solvent to obtain solution of sulfonated polyether-ether-ketone (10-15 wt.%);    (C) adding N,N'-carbonyldiimidazole (CDI), where mol ratio of CDI and sulfoacid radical in sulfonated polyether-ether- ketone is 1:2-4 and then stirring 1-3 hours;    (D) adding coupling agent and then stirring for 1.5-4 hours to obtain reaction solution of sulfonated polyether-ether-ketone, where mol ratio of coupling agent and CDI is 1:1;    (E) reacting with inorganic crosslinking agent at 50-80 degrees C for 6-12 hours and then adding proton conductor, where weight ratio of conductor and sulfonated polyether-ether-ketone is 1:3.5-17;    (F) reacting for 8-14 hours to obtain mixed solution of sulfonated polyether-ether-ketone/inorganic crosslinking agent/proton conductor; and    (G) utilizing proton exchange membrane with mixed solution of sulfonated polyether-ether-ketone/inorganic crosslinking agent/proton conductor, membrane-forming, drying and then membrane-removing to obtain the fuel cell.