NOVELTY - A polyether sulfone type proton exchange film comprises perfluorinated sulfonic acid with polymer of polyether sulfone main chain and lateral chain of perfluorinated sulfonic acid; the polyether sulfone polymer main chain comprising common aromatic ring, benzene ring introduced between polyether sulfone main chain and lateral chain of perfluorinated sulfonic acid; and lateral chain of perfluorinated sulfonic acid comprising 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-2-benzene ethoxy) ethane sulfonic acid.    USE - Polyether sulfone type proton exchange film used in preparation of proton exchange film in proton exchange film fuel battery (claimed).    ADVANTAGE - The proton exchange film has higher proton conductivity at 80 degrees C, low swelling ratio and high proton conductivity.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a preparation of polyether sulfone type proton exchange film comprising taking bromine-containing phenyl p-dioxybenzene monomer, p-dioxybenzene and 4,4'-dichlorodiphenyl sulfone monomer or 4,4'-difluorodiphenyl sulfone monomer at mol ratio of 1:0-1:1-2, packing anhydrous potassium carbonate 1.05 times of the 4,4'-dichlorodiphenyl sulfone monomer or 4,4'-difluorodiphenyl sulfone monomer, organic solvent 4 times of reaction substance, and azeotropy dehydrating agent (50%) to reaction container; charging nitrogen and stirring; heating mixture, reacting for 1-3 hours, discharging azeotropy dehydrating agent, heating mixture at 190-210 degrees C for 7-10 hours, extracting obtained polymer solution from deionized water, grinding, washing and drying polymer solution to obtain polyether sulfone polymer containing the bromobenzene lateral radical; packing polyether sulfone polymer containing bromobenzene lateral radical to grafting container having stirring device and using second organic solvent to dissolve, adding copper powder, vacuumizing mixture and charging high-purity nitrogen, vacuumizing mixture and charging high-purity nitrogen, repeating for 2-5 times, sealing mixture and stirring, heating mixture at 90-120 degrees C and reacting for 2-4 hours; and dissolving 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-2-benzene ethoxy) ethane sulfonic acid in second organic solvent, adding to grafting container, with polyether sulfone containing bromobenzene lateral radical to potassium 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-iodine ethoxy) ethanesulfonate at mass ratio of 1:1.2, maintaining temperature at 90-120 degrees C for 5-8 hours, discharging materials to deionized water, grinding and washing for 3-5 times, filtering and drying to obtain polyether sulfone type proton exchange film comprising perfluorinated sulfonic acid;and    (2) application of polyether sulfone type proton exchange film comprising perfluorinated sulfonic acid in preparation of proton exchange film in proton exchange film fuel battery comprising putting polyether sulfone polymer to 4-6 mol/L hydrochloric acid solution (8-10 g/L), soaking for 48 hours, filtering mixture, using deionized water to wash mixture for 3-5 times, re-filtrating again, vacuumizing and drying; using N,N-dimethyl acetamide or N-methyl pyrrolidone to dissolve, casting mixture on glass plate, drying glass plate for 2 hours at 60 degrees C, drying for 2 hours at 80 degrees C, heating glass plate at 100 degrees C and drying for 2 hours; and heating glass plate at 120 degrees C for 2 hours, reducing temperature to 80 degrees C, vacuumizing glass plate, drying for 2 hours, heating glass plate at 100 degrees C, drying for 2 hours, using method of discharging gas at room temperature to remove N,N-dimethyl acetamide or N-methyl pyrrolidone to obtain polyether sulfone type proton exchange film comprising perfluorinated sulfonic acid.