A nitrogen-doped carbon nanotube/manganese-cobalt oxide nano composite material for lithium battery electrodes is provided; compared with traditional batteries, the lithium ion batteries (LIBS) have the advantages of high working voltage, long cycle life, high specific energy, environmental friendliness and the like, and are widely applied in various fields. Through a method with solvothermal assisted with high-temperature pyrolysis, a non-stoichiometric Mn-Co/CNT composite material is synthesized and is modified by using dicyandiamide as an N source, and thus N-doped nano CNT/Mn-Co composite material (NCNT/Mn-Co) is synthesized. Compared with CNT/Mn-Co, the N-doped NCNT/Mn-Co shows excellent electrochemical performance and has the following advantages: 1, dicyandiamide plays a surfactant role in a metal oxide deposition process, and makes Mn-Co nano particles smaller; and introduction of nitrogen also increases the chemical-bond bonding force between Mn-Co and CNT; and 2, imidization reaction in an N doping process reduces oxidation of CNTs, so that the electrical conductivity of the material is effectively increased. In conclusion, the method provides a possibility for development of novel high-charging-capacity and large-specific-capacity lithium ion battery negative electrode materials.