NOVELTY - Raw material of sp2 hybridized carbon nano material is backflow treated using concentrated nitric acid, to obtain purified sp2 hybridized carbon nano material. The surface of the nano material is functionalized with plasma. The functionalized material is dispersed in mixture of metal salt precursor solution and reducing agent solution and backflow treated. The treated liquid is filtered and vacuum dried to obtain composite catalyst of noble metal and sp2 hybridized carbon nano material as proton exchange membrane fuel cell catalyst.    USE - Manufacture of proton exchange membrane fuel cell catalyst.    ADVANTAGE - The proton exchange membrane fuel cell catalyst with high density, evenly arranged surface functional group, excellent damage resistance, reduced migration of electrons between the metal nanoparticles and the sp2 hybridized carbon nano material and excellent electro-catalytic property is manufactured.    DETAILED DESCRIPTION - Raw material of sp2 hybridized carbon nano material is backflow treated using 30-70 %mass concentrated nitric acid at 120-150 degrees C, and washed with distilled water until the pH is 6-7. The liquid is filtered and vacuum dried for 12-24 hours at 80-120 degrees C. The sp2 hybridized carbon nano material is roasted in order to remove the impurities and obtain purified sp2 hybridized carbon nano material. The purified material is added into a plasma reactor and plasma is discharged to obtain surface functionalized sp2 hybridized carbon nano material. A metal salt precursor solution with noble metal content of 1.0-15.0 mg/mL and solution containing reducing agent with volume ratio of reducing agent and water of (50-1):1 is prepared and the functionalized material is ultrasonically dispersed for 20-60 minutes. An alkali solution is added to adjust the pH to more than 13, and mixed solution of metal salt and sp2 hybridized carbon nano material containing the nano material and solution containing reducing agent in the volume ratio of 20-30:1-5 (mg/ml), is obtained. The noble metal content in the precursor solution is 1-60 %mass of the mass of the nano material. The mixed solution is heated to 120-140 degrees C, and backflow treated under atmosphere of inert gases for 3-5 hours. Alcohol and distilled water are used to wash the mixed solution after backflow treatment till the mixed solution becomes colorless and transparent and does not contain chloride ion. The reaction liquid is filtered, vacuum dried for 12-24 hours at 80-120 degrees C to obtain composite catalyst of noble metal and sp2 hybridized carbon nano material as proton exchange membrane fuel cell catalyst.