The invention provides a nitrogen doped carbon partially covered tin oxide nano sheet material and a preparation method and application thereof. The material comprises a conductive substrate, whereinthe surface of the conductive substrate is covered with a NO2 nano sheet, part of the surface of the NO2 nano sheet is covered with nitrogen-doped carbon, and the NO2 nano sheet has a plurality of pore structures. The preparation method comprises the following steps of: preparing the NO2 nano sheet on the surface of the conductive substrate by adopting a hydrothermal method; placing the conductivesubstrate with the surface covered with the NO2 nano sheet into a solution containing pyrrole; depositing polypyrrole on the surface of the NO2 nano sheet with the surface covered with the NO2 nano sheet by adopting an electrochemical method to obtain a precursor; and heating the precursor in an inert atmosphere to not less than 450 DEG C for heat treatment; the deposition time of the electrochemical method is less than 5 min. The material provided by the disclosure has better starting voltage, higher current density and stronger stability.