The invention discloses a preparation method of a nitrogen-doped rutile TiO2/C negative electrode material for a sodium-ion battery. The preparation method comprises the steps of adding a nitrogen source and a carbon source into a titanium source-containing solution, carrying out ball milling, drying, and then sintering in protective atmosphere to obtain the target material. According to the preparation method, the double doping of the nitrogen element to a TiO2 main body and a carbon cladding layer is realized by one-step heat treatment. The prepared material is nano particles which are taken as the negative electrode of the sodium-ion battery, and has high specific discharge capacity and excellent circulatory stability. According to the preparation method, the process flow is short, the operation is simple, and the industrial production can be realized easily.