NOVELTY - A fuel cell cathode catalyst preparation method involves obtaining moderate oxidation carbon nano tube/melamine/polyaniline/ferric compound (moCNTs/PANI/Mela-Fe compound) by dissolving ammonium persulfate solution into hydrochloric acid solution, discharging nitrogen gas with prepared moCNTs/PANI/Mela-Fe compound in a tubular furnace, heating and cooling the discharged nitrogen gas, heating the cooled product with Hydrochloric acid, followed by cooling the heated product at room temperature to obtain Nitrogen doped carbon nanotubes (N-CNTs) electric catalyst.    USE - Method for preparing fuel cell cathode catalyst.    ADVANTAGE - The method enables preparing fuel cell cathode catalyst.    DETAILED DESCRIPTION - A fuel cell cathode catalyst preparation method involves stirring uniformly 0.25-1.0 mol/L hydrochloric acid solution, moderate oxidation carbon nano tube (moCNTs), polyaniline, melamine and ferric trichloride in reactor, where mass ratio of moderate oxidation carbon nano tube, polyaniline and melamine is 1: 1-12: 6-7, mass ratio of mixed moderate oxidation carbon nano tube with polyaniline and melamine and ferric trichloride is 1: 0.03-0.06, volume ratio of the reacting mixed liquid and hydrochloric acid solution is 1: 20-30, controlling temperature of reacting mixed liquid is 0-5 degrees C, stirring speed of the reaction mixed liquid is based on 3-5 drops per second drip ammonium persulfate solution, generating slow polymerization in the stirred solution before adding polyaniline, mass ratio of the ammonium sulfate and the polyaniline is 2.5: 1, heating the stirred solution at 0-5 degrees C for 24 hours, filtering the heated solution, washing the filtered solution using water and alcohol, drying the washed solution at 50 degrees C for 24 hours. A moderate oxidation carbon nano tube/melamine/polyaniline/ferric compound (moCNTs/PANI/Mela-Fe compound) is obtained by dissolving 0.5-1.0 g/m ammonium persulfate solution concentration into 0.25-1.0 mol/L hydrochloric acid solution, discharging nitrogen gas with prepared moCNTs/PANI/Mela-Fe compound in a tubular furnace, heating the discharged nitrogen gas from 10 degrees C to 600-700 degrees C for 1 h, cooling the heated product in room temperature and at nitrogen atmosphere, heating the cooled product with 0.5-1.0 mol/L Hydrochloric acid at 80 degrees C for 10 hours, heating the filtered and dried product in the tubular furnace at 600-700 degrees C for 3 hours after suction filtration and drying the heated product, followed by cooling the heated product at room temperature to obtain final Nitrogen doped carbon nanotubes (N-CNTs) electric catalyst.