NOVELTY - Preparing doped polyaniline directly-carbonized complex electrocatalyst, comprises (a) dissolving aniline in hydrochloride solution to form aniline hydrochloride solution (A), (b) dissolving ferric chloride hexahydrate solid in hydrochloride solution and adding ammonium persulfate (B), (c) mixing solution A and solution B, stirring and allowing to stand to form a paste, (d) adding acetone, stirring, filtering to obtain solid and drying in vacuum to obtain a catalyst precursor, (e) crushing the catalyst precursor, heating and cooling to obtain doped polyaniline directly carbonized product.    USE - The doped polyaniline directly-carbonized complex electrocatalyst is useful in fuel cells.    ADVANTAGE - The doped polyaniline directly-carbonized complex electrocatalyst: has strong electro-catalytic activity for oxygen reduction reaction. The preparation method is simple; uses wide source of the raw material; and is economical.    DETAILED DESCRIPTION - Preparing doped polyaniline directly-carbonized complex electrocatalyst, comprises (a) dissolving 368 mu l aniline in 20 ml 1 mol/l hydrochloride solution to form aniline hydrochloride solution, which is marked as A, (b) dissolving 0-1.38 mg ferric chloride hexahydrate solid, 0-1.38 mg cobalt(II) nitrate hexahydride solid or 0-1.38 mg ferric chloride hexahydrate and cobalt(II) nitrate hexahydride solid in 20 ml 1mol/l hydrochloride solution, and adding 1.14 g ammonium persulfate and the resulting solution is denoted as B, where the mass ratio of ferric chloride hexahydrate and cobalt(ii) nitrate hexahydride is 1:1, (c) rapidly mixing solution A and solution B, completely stirring, and allowing to stand at 20 degrees C for 24 hours to form a paste, (d) adding 40-100 ml acetone to the paste, stirring, filtering to obtain the solid, maintaining the solid at room temperature for 2 hours, drying in vacuum for 24 hours to obtain a catalyst precursor, (e) crushing the dried catalyst precursor, adding into a tubular furnace, filling the furnace tube with nitrogen for half an hour, increasing the temperature from the room temperature to 350 degrees C, maintaining for 2 hours, heating at 700 degrees C for 2 hours at a heating rate of 2 degrees C/minute, cooling to room temperature, and stopping nitrogen flow to obtain doped polyaniline directly carbonized product and (f) adding 0.5M sulfuric acid solution to the obtained doped polyaniline directly carbonized product, retaining in 80 degrees C water bath for 8 hours, where sulfuric acid dosage is 10 times the carbonized product, and drying in vacuum for 24 hours, and heating for the second time at 900 degrees C with the heating rate of 5 degrees C/minute to obtained the doped polyaniline directly-carbonized complex electrocatalyst. INDEPENDENT CLAIMS are also included for: (1) doped polyaniline directly-carbonized complex electrocatalyst prepared by as mentioned above; and (2) use method of doped polyaniline directly-carbonized complex electrocatalyst, comprising mixing doped polyaniline directly-carbonized electrocatalyst and anhydrous ethanol, adding 5% Nafion (RTM: Perfluorinated resin) solution, carrying out ultrasonic treatment of the mixture to form a paste, dropping the paste on a glassy carbon electrode surface and drying as a working electrode, using as normal three-electrode system for measuring oxygen saturation of sulfuric acid or sodium hydroxide solution, and measuring the catalyst for oxygen reduction reaction of the electro-catalytic activity.