Preparation method of low-cost high-magnification graphite negative electrode material

The invention discloses a preparation method of a low-cost and high-magnification graphite negative electrode material. The low-cost and high-magnification graphite negative electrode material is prepared by mixing, coating and granulating, screening, graphitizing, pickling and puffing and carbonizing in sequence. The raw materials adopted by the invention are non-value tailings in graphite negative electrode production and are recycled, the material cost is low, a double-motion mixer is adopted for mixing, the problem that ultrafine powder is difficult to mix uniformly is solved, meanwhile, two times of screening are adopted in the semi-finished product processing process, large-particle-size materials are removed, the granularity is kept uniform, and the product quality is improved. According to the present invention, the surface damage to the normal material is reduced, the rate performance can be easily improved, the specific surface of the material cannot be increased, the first efficiency can be easily