NOVELTY - A nitrogen-sulfur-codoped carbon microspheres preparing method involves adding carbon source, nitrogen source, sulfur source and analytically pure surfactant into a stainless steel reaction kettle, stirring and sealing the reaction kettle. The reaction kettle is put in a crucible furnace. The mixture is taken out when the reaction kettle is cooled. The mixture is washed with ethanol, dilute hydrochloric acid and distilled water and filtered. The obtained powder is dried. The obtained product is mixed with analytically pure potassium hydroxide powder and activated in argon atmosphere.    USE - Method for preparing nitrogen-sulfur-codoped carbon microspheres that is utilized in fuel cell catalysts.    ADVANTAGE - The method enables preparing nitrogen-sulfur-codoped carbon microspheres with high repeatability, high oxygen reduction catalytic activity, high catalytic activity, good stability and good tolerance to methyl alcohol and carbon monoxide in simple, mild and cost-effective manner.    DETAILED DESCRIPTION - A nitrogen-sulfur-codoped carbon microspheres preparing method involves adding 20-82 mass% carbon source, 11-70 mass% nitrogen source, 1-10 mass% sulfur source and 1-10 mass% analytically pure surfactant into a stainless steel reaction kettle in sequence under nitrogen protection, stirring for 2-10 minutes and sealing reaction kettle. The reaction kettle is put in a crucible furnace to heat at 300-500 degrees C for 6-36 hours. The mixture is taken out when the reaction kettle is naturally cooled to room temperature. The mixture is washed with ethanol, dilute hydrochloric acid and 3-6 times of distilled water and filtered. The obtained powder is dried in a vacuum drying oven at 60-100 degrees C for 6-12 hours. The obtained product is uniformly mixed with analytically pure potassium hydroxide powder according to ratio of 1-4:1-2 at 500-900 degrees C for 0.5-2 hours, in box-type atmosphere furnace and activated in an argon atmosphere to obtain a nitrogen-sulfur-codoped carbon microspheres.