A nanoporous copper-silicon negative electrode sheet and preparation method thereof, and nanoporous copper-silicon negative electrode sheet comprises a current collector matrix, wherein the current collector matrix is provided with a plurality of nanometer micropores, and silicon is deposited in the nanometer micropores. During preparation, the copper alloy foil is pretreated to remove the non-copper component in the copper alloy foil, and the nanoporous copper current collector with several nanopores is obtained. Nanoporous copper-silicon negative electrode sheet is prepared by chemical vapordeposition (CVD) from nanoporous copper collector. Nanoporous copper-silicon negative electrode sheet can improve the energy density of the battery, improve the cycle performance, and improve the thickness expansion of the negative electrode sheet before and after charging.