TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation: The preparation method of the antioxidation and degradable composite membrane comprises: (a) mixing the peroxide decomposing catalyst and organic solvent, vibrating by ultrasonic for 10-60 minutes to obtain evenly scattered suspensoid, where the consistency of the catalyst is 1-20 wt.%; (b) dissolving the proton exchange resin in solvent to prepare an even membrane-make solvent containing 3-30 wt.% proton exchange resin; (b) mixing and uniformly stirring the catalyst or suspension of catalyst/organic solvent, where the weight ratio of catalyst to proton exchange resin to solvent is 1:5-50:120; and (d) pouring the membrane-make solvent prepared in (c) and jet on a support, drying at 5-100 degrees C for 8-24 hours, baked in a 120 degrees C vacuum baker for 3-24 hours, and taking out and submerging deionized water to shield off a model and take off the composite membrane, where the support for pouring is compact and smooth glass, metal, ceramic or plastic, or a multi-hole film covered on it; or mixing the membrane-make solvent containing catalyst prepared in (c) with carbon fiber or carbon nanometer tube, where the weight ratio of the carbon fiber or carbon nanometer tube to the proton exchange membrane resin is 0.5-5%; pouring the even mixture on a support, drying at 5-100 degrees C for 8-24 hours, baking in a 120 degrees C vacuum baker for 3-24 hours0, and taking out and submerging in deionized water to shield off a model and take off the composite membrane, where the support for pouring is compact and smooth glass, metal, ceramic, or plastic. Preferred Components: The proton exchange membrane resin is non-fluorin proton exchange membrane resin or total fluosulfonic acid resin. The non-fluorin proton exchange membrane resin is sulfonated poly(phthalazinone) ether sulfone (PPES), sulfonated polyether-ether-ketone, parts of fluorinated and sulfonated polystyrene, parts of fluorinated and sulfonated PPES, or parts of fluorinated and sulfonated polyether-ether-ketone. The antioxidation and degradable composite membrane comprises proton exchange membrane resin, peroxide decomposing catalyst, and reinforcing material; wher the reinforcing material is a multi-hole membrane made of polytetrafluoroethylene, kynoar polyvinylidene fluoride, polypropylene or polyethylene, having 5-50 mu m thickness, 0.05-1 mu m aperture and 60-95% porosity; and the multi-hole membrane is buried in the proton exchange resin and peroxide decomposing catalyst. The organic solvent is N,N-dimethyl acetamide, N,N-dimethyl formamide, dimethyl sulfoxide, 1-methyl-2-ketopyrrolidine, acetone, or n- acetone. The solvent with high boiling point is N,N-dimethyl acetamide, N,N-dimethyl formamide, dimethyl sulfoxide, or 1-methyl-2-ketopyrrolidine. The low boiling point cosolvent is acetone, propanol, isopropyl alcohol, or tetrahydrofuran. Preferred Composition: The prepared antioxidation and degradable composite proton exchange membrane is 15-120 mu m thick; or when the reinforcing material is carbon fiber or carbon nanometer tube from fiber material, the weight ratio of the fiber material to proton exchange membrane resin is 0.5-5%. The bearing quantity of silver (Ag), palladium (Pd), or ruthenium (Ru) of the bearing type catalyst is 1-10% of the weight of the catalyst. The particle diameter of the catalyst is 0.005-1.0 mu m, preferably 0.01-0.5 mu m. The amount of the catalyst is 2-8 wt.%. The volume of the low boiling point cosolvent is less than or equal to 50%. The prepared proton exchange resin is 10-20 wt.% of membrane-making solvent. Preferred Process: The proton exchange resin membrane is used as a middle layer. The composite membrane prepared is hot pressed on two sides of the middle layer; or the membrane-make solvent containing catalyst is poured or jetted at two sides of the middle layer to form a three-layer composite structure.