The invention discloses an anode material for a lithium-ion power battery and a preparation method of the anode material, and relates to the field of preparation of battery materials, in particular tothe field of preparation of the anode materials of lithium batteries. The anode material is characterized by being prepared from porous silicon dioxide and coating compound asphalt, wherein porous silicon dioxide is prepared from raw materials as follows: polycrystalline silicon powder, hydrochloric acid, silver carbonate, hydrofluoric acid and hydrogen peroxide; the compound asphalt is preparedfrom materials as follows: nano calcium carbonate, asphalt, graphene, sodium hydroxide, a binder and distilled water; after porous silicon dioxide and the compound asphalt are mixed uniformly in a ratio being 5:(3-5), a mixture is carbonized, and a silicon-carbon anode material is prepared. The prepared silicon-carbon composite material has the effect of improving rate performance and safety performance while the transfer number of lithium ions is increased and stacking of the lithium ions is reduced, further has advantages of high gram volume, excellent cycle performance, high liquid absorption and retaining capability, low cost and low expansion rate, and is particularly suitable for meeting demands of high-energy-density batteries for the anode material.