TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: A strong oxidizer used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is potassium permanganate and concentrated sulfuric acid. A reducing agent used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is hydrazine hydrate, sodium borohydride, hydroiodic acid, hydrobromic acid.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: A silylation reagent used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is 3-amino propyl triethoxy silane, 3-amino propyl trimethoxy silane, ( gamma )-(methacryloyl oxygen) propyl trimethoxy silane and 3-(methacryloyl oxygen) propyl methyl dimethoxy silane. A vinyl monomer used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is styrene, 2-propylene-2-methyl propane sulfonic acid, acrylamide and/or methyl acrylic ester. A solvent used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is ethanol, toluene and/or thionyl chloride. The amount of solvent is per 100 mg graphene oxide is 10-100 mL. A surfactant used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is sodium lauryl sulfate and/or dodecylbenzene sulfonate. An initiator used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is benzoyl peroxide, potassium persulfate, sodium persulfate, ammonium persulfate and azo-bis-isobutyronitrile. An organic solvent used for preparing modified graphene/sulfonated polyphenylene oxide proton exchange membrane is N-methyl pyrrolidone, tetrahydrofuran, N,N-dimethyl formamide, acetone, ethanol, diethyl ether and dimethyl sulfoxide. The amount of organic solvent per 10 mg modified graphene is 5-50 mL. Preferred Properties: The mass ratio of silylation reagent and graphite oxide is (1-100):1. The mass ratio of vinyl monomer and graphene oxide is (10-80):1. The mass ratio of the surfactant and vinyl monomer is 1:(50-200). The mass ratio of initiator and graphene oxide is (0.2-2):1. The mass ratio of reducing agent and graphene oxide is (40-160):1. The mass ratio of strong oxidizer and crystalline flake graphite is (1-15):1.