Graphite waste-based regenerated active material as well as preparation and application thereof

The invention belongs to the field of graphite waste treatment, and particularly discloses a method for regenerating an active material based on graphite waste, which comprises the following steps: heating the graphite waste in an oxygen-containing atmosphere for pretreatment to obtain a graphite material A; mixing and slurrying the graphite material A, an alkaline substance and a boron source to obtain slurry, then carrying out subcritical treatment and solid-liquid separation to obtain a graphite material B, mixing the graphite material B with an acid solution, and carrying out acid treatment to obtain a graphite material C; performing pressure infiltration heat treatment on the graphite material C and the carbon source A to prepare a graphite material D; the pressure infiltration heat treatment stage comprises first-stage pressure infiltration treatment under the pressure P1 and the temperature T1 and second-stage heat treatment under the pressure P2 and the temperature T2; the P1 is more than 1MPa, and th