Method for preparing SiOx composite anode material

The invention relates to a method for preparing a SiOx composite anode material. The method is characterized by comprising the following steps of: thermally processing SiOx powder with the average grain diameter of 1-20 mu m under argon protection at 900-1200 DEG C for 1-10 h, and naturally cooling to room temperature; adding deionized water or absolute ethyl alcohol, the mass of which is 3-10 times of that of the SiOx powder, into the SiOx powder, and grinding for 0.5-10 h so as to obtain uniformly dispersed slurry; and, uniformly mixing the slurry with a conductive agent and a binding agent, performing spray drying, wherein the inlet temperature for spray drying is at 200-350 DEG C; the outlet temperature for spray drying is at 80-140 DEG C; and thus, the SiOx composite anode material is obtained. The SiOx composite anode material prepared by the invention has the advantages of being relatively high in first-time charging and discharging efficiency, better in cycle performance and the like, and is applied to application of an anode material of a lithium ion battery; and the method disclosed by the invention is simple in process, relatively low in cost and convenient for industrial production.