NOVELTY - A carbon paper or thin foamed nickel is cut into multiple rectangular substrates, single-walled carbon nanotubes are discharged or printed onto substrate, to form combined electrode. The combined electrode is electroplated at 40 degrees C for 5-50 seconds using sulfate or nitrate solution as plating solution and platinum, palladium, molybdenum, nickel, cobalt, yttrium and scandium as metal catalyst having particles size of 5 mm to 5 mu m, to form catalyst layer on the single-walled or multi-walled carbon nanotube film which is formed on combined electrode surface.    USE - Preparation of combined electrode used for fuel cell.    ADVANTAGE - The method efficiently and economically prepares combined electrode having high efficiency and conductive characteristics.    DETAILED DESCRIPTION - A carbon paper or thin foamed nickel is cut into multiple rectangular substrates each having size of 30 mmx 50 mm, single-walled carbon nanotubes are discharged onto the substrate by using arc discharging method or printed on substrate using screen printing method, to form combined electrode. The combined electrode is electroplated at 40 degrees C for 5-50 seconds in direct current voltage of 0.5-5 V using sulfate or nitrate solution as plating solution and platinum, palladium, molybdenum, nickel, cobalt, yttrium and scandium as metal catalyst having particles size of 5 mm to 5 mu m, graphite rod or graphite plate as anode and carbon paper or thin foamed nickel as cathode, to form catalyst layer on the single-walled or multi-walled carbon nanotube film which is formed on the surface of the combined electrode. An INDEPENDENT CLAIM is included for device for testing combined electrode, which comprises an upper electrode fixing metal plate, an upper graphite electrode plate, an upper combined electrode, a proton-exchange film, a lower combined electrode, a lower graphite electrode plate, a lower electrode fixing metal plate, an oxygen inlet tube, an oxygen outlet tube, a catalyst layer, a voltmeter, a hydrogen outlet tube, a hydrogen inlet tube, a support, a manual control lifting valve, a thermoelectric coupler, a temperature control water tank, a temperature control heater, a hydrogen humidifier outlet tube, a hydrogen humidifier, an oxygen humidifier, a hydrogen flow meter outlet tube, a hydrogen flow meter, a hydrogen flow meter inlet tube, an oxygen flow meter inlet tube, an oxygen flow meter, an oxygen flow meter outlet tube, an oxygen humidifier inlet tube, an oxygen humidifier outlet tube, a hydrogen humidifier inlet tube and a gas tank. The lower electrode fixing metal plate, lower graphite electrode plate, lower combined electrode, proton exchange film, upper combined electrode, upper graphite electrode plate and upper electrode fixing metal plate are orderly arranged in the support from the bottom to top. The oxygen inlet tube and oxygen outlet tube are arranged on the lower electrode fixing metal plate. The hydrogen outlet tube and hydrogen inlet tube are arranged on the upper graphite electrode plate. The manual control lifting valve is arranged on the upper electrode fixing metal plate. The hydrogen humidifier and oxygen humidifier are placed in the temperature control water tank, and the temperature control heater is arranged under the temperature control water tank. The hydrogen bottle is connected with the inlet tube of the hydrogen flow meter. The outlet tube of hydrogen flow meter is connected with the inlet of the hydrogen humidifier inlet tube. The inlet of the hydrogen humidifier is connected with the hydrogen inlet tube. The oxygen bottle is connected with the oxygen flow meter inlet tube, the oxygen flow meter outlet tube is connected with the oxygen humidifier inlet tube, and the oxygen humidifier outlet tube is connected with the oxygen inlet tube. The anode and cathode of the voltmeter are respectively connected with the lower electrode fixing metal plate and upper electrode fixing metal plate. The carbon paper and thin foamed nickel substrate are arranged on each of upper combined electrode and lower combined electrode. The single-wall or multi-wall carbon nano tube film is arranged on the carbon paper and thin foamed nickel substrate, and the catalyst layer (10) is arranged on the single-wall or multi-wall carbon nano tube film.