The invention discloses a preparation method of a nitrogen-doped porous carbon / carbon nanotube compound with an interpenetrating network structure. The asphalt and additives are mixed, then a solvent is added, stirred and mixed evenly, and then the solvent is distilled off, followed by drying, carbonization and other processes to prepare fluffy graphitized porous carbon. The graphitized porous carbon is added into an ethanol aqueous solution and ultrasonicated for 20 minutes, then a nitrogen source and a transition metal catalyst are added, stirred in a water bath, dried, carbonized, and finally pickled, washed with water, washed with alcohol, and dried. In the present invention, carbon nanotubes can be obtained by in-situ growth on the inner and outer surfaces of the fluffy graphitized porous carbon prepared by asphalt, the process is simplified and controllable, the production efficiency is high, the utilization rate of energy is greatly improved, and it is beneficial to reduce carbon The entanglement of the nanotubes is easy to disperse, and the preparation process is simple, the cost is low, and the industrial production is easy.