A preparation method for a carbon-silicon composite material is characterized by comprising: taking silicon powder, silicon sol, molybdenum disulfide and biphenyl, adding into a stirred kettle, stirring, heating, and adding melt coal tar pitch, so as to prepare a silicon-powder additive mixed solution; adding carbon black powder, graphite powder, pitch coke powder and petroleum coke powder into a kneading kettle for kneading, heating, adding the silicon-powder additive mixed solution, stirring and mixing to prepare a clinker; and performing hot rolling on the mixed clinker to obtain thin sheets, cooling, grinding into a powder, performing compression molding, roasting, performing coal tar pitch dipping, rough turning, performing resin dipping, turning, performing secondary resin dipping, and curing to obtain a finished product. Through the combination of carbon and silicon, the silicon powder has good wear resistance; a grinding kettle end and carbon graphite have auxiliary motion or relative independent motion, carbon graphite is not easy to grind and extrude, is relatively easy to extrude on the end surface of the grinding kettle, so that relatively slide between materials is formed; and the prepared carbon-silicon composite material has a service life being 2-3 times of the service life of a conventional material.