The invention provides a method for preparing nitrogen-doped graphitized carbon. Metal ions are introduced into a nitrogen-doped carbon material body, after a mixture is subjected to high-temperaturethermal treatment, then the metal ions are removed, and the nitrogen-doped graphitized carbon material is obtained. The method for preparing nitrogen-doped graphitized carbon is simple, the particle size is small, graphitized carbon prepared by the method is used as a lithium ion battery cathode material, the specific capacity of 354.6 mAh/g can be achieved, the circulation performance is excellent, and after 100-time circulation, the capacity retention ratio is stabilized at 99%.