The invention provides a silicon carbon material and a preparation method thereof, and a negative electrode material. The method comprises the steps of: S1, dispersing flaky graphene oxide in a firstsolvent to form a graphene oxide dispersion, dispersing the nano-silicon in a second solvent to form a nano-silicon dispersion, the first solvent having a boiling point higher than 180 DEG C, and thesecond solvent having a boiling point lower than 120 DEG C; S2, mixing the two dispersions under mechanical stirring at a stirring speed of not less than 500 r/min and a stirring time of 30-120 minutes to obtain a mixture; S3, removing the second solvent in the mixture and part of all of the first solvent to obtain a pre-coated product; S4, dispersing the pre-coated product and a polymer coating agent in a third solvent, and performing spraying and drying to obtain a solid product; and S5, performing heat-treatment of the solid product in an inert atmosphere to obtain a silicon carbon material. The negative electrode material containing the silicon carbon material can effectively improve the first discharge efficiency and the cycle stability of the lithium ion battery.