Abstract: A secondary granulated silicon-carbon battery anode material and its preparation method is disclosed. The secondary granulated silicon-carbon battery anode material comprises a carbon substrate, a plurality of nano-silicon and a modified layer. According to the preparation method of the secondary granulated silicon-carbon battery anode material, the nano-silicon is embedded into the surface pores of the carbon substrate, and the modified layer is coated on them, so that the uniformity of the battery during size mixing and the liquid permeability of the anode material can be improved, and the effect of effectively improving the cycle performance and the stability of the battery can be further achieved.