Abstract: The invention belongs to the technical field of material synthesis, and discloses a nitrogen-doped hollow cobaltosic oxide and a preparation method and application thereof. A chemical formula of the nitrogen-doped hollow cobaltosic oxide is Co3O4—COF-T-D@C—N; and the COF-T-D is a covalent organic framework. Due to an open hollow structure, the nitrogen-doped hollow cobaltosic oxide of the invention has a large specific surface area, thus having a large contact area with an electrolyte, which is convenient for lithium ions to transport therein. The open hollow structure also prevents a volume effect from being generated during charging and discharging, and nitrogen is introduced for doping, so that granules can be gradually activated to increase the specific surface area and active sites, a discharge (cycle) stability of the material is improved, and a rate performance of the material is improved.