NOVELTY - Preparing three-dimensional graphene-carbon nitrogen nanotube composite material involves: a) putting foam nickel in tube furnace, heating to 300-1000 degrees C under the inert atmosphere, feeding carbon source, cooling to form three-dimensional nickel-graphene foam (F1); b) soaking foam (F1) in catalyst solution, and drying; putting foam (F1) which is loaded with catalyst in tube furnace, heating to 300-1000 degrees C under the inert atmosphere, feeding carbon source, and then cooling to form three-dimensional graphene-carbon nitrogen nanotube composite material.    USE - For preparing three-dimensional graphene-carbon nitrogen nanotube composite material (claimed) which is used for fuel batteries, electrochemical electrode, super capacitor and super-oleophylic foam.    ADVANTAGE - The present method uses two-step chemical vapor deposition technology; directly grows carbon nanotube on the surface of the three-dimensional graphene; realizes the effective composition of the three-dimensional graphene and the carbon nanotube; and realizes the functionality of the carbon base three-dimensional structure through introducing aza-atom into carbon nanotube. Compared with the other preparation methods of three-dimensional graphene-carbon nitrogen nanotube composite material, the present method is simple; has low cost; and also provides high product conductivity. The three-dimensional graphene-carbon nitrogen nanotube composite material obtained by the present method has excellent property on the aspects of catalysis oxygen reduction reaction, electrochemistry capacitor, electrochemistry biological sense and ultra-lyophobic oleophilic foam; and has good potential application value on the aspects of ionized battery, medicine transformation and micro-reactor.    DETAILED DESCRIPTION - Preparing three-dimensional graphene-carbon nitrogen nanotube composite material involves: a) putting the foam nickel in the middle zone of the quartz tube in the tube furnace, heating to 300-1000 degrees C under the inert atmosphere, feeding carbon source, after the reaction, naturally cooling to the room temperature under the inert atmosphere to obtain three-dimensional nickel-graphene foam; b) soaking the obtained three-dimensional nickel-graphene foam in the catalyst solution for 5-30 minutes, taking out, and drying; c) putting the nickel-graphene foam which is loaded with catalyst in the middle zone of the quartz tube in the tube furnace, heating to 300-1000 degrees C under the inert atmosphere, feeding carbon source, after the reaction, naturally cooling to the room temperature under the inert atmosphere to obtain three-dimensional graphene-carbon nitrogen nanotube composite material.