The invention provides a preparation method of a silicon-carbon negative electrode material. The preparation method comprises the following steps of performing mixing on SiOx, asphalt and a dopant according to a ratio, so that the mixture is uniformly dispersed; under an inert atmosphere, carrying out pre-coating on the mixed and dispersed materials; carrying out heating and heat preserving on thepre-coated materials in an inert atmosphere; and performing cooling, then carrying out sieving and grading on the obtained materials in an inert atmosphere, carrying out high-temperature heat treatment on the graded materials, and cooling to room temperature to obtain the silicon-carbon negative electrode material. The method disclosed by the invention is simple in process and low in cost, and isvery easy for industrial mass production; and after doping the silicon carbon material is obviously improved in terms of rate, cycling performance and the like.