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The application provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode sheet and a battery. The silicon-carbon negative electrode material comprises a core and a carbon coating layer coated on the core; the core comprises a porous carbon framework and silicon particles, and the silicon particles are arranged in the pores of the porous carbon framework; there is a gap between the silicon particles and the surface of the pores of the porous carbon framework; in the core, the volume of the gap is V1, the volume of the silicon particles is V2, and V1 / V2 is 0.04-0.9. The silicon-carbon negative electrode material provided by the application has a buffer cavity reserved between the silicon particles and the pores of the porous carbon framework for silicon expansion, and can realize a silicon-carbon negative electrode material with low expansion and excellent electrical performance.