The invention provides a lithium ion battery negative electrode comprising a diamond-like thin film layer. The negative electrode comprises a conductive current collector, a negative electrode active material layer arranged on the conductive current collector and a diamond-like thin film layer deposited on the surface of the negative electrode active material layer; and the diamond-like thin film layer comprises doped elements, wherein the doped elements comprises one or more of Si, B, N, P, Al, Be, Mg, Ti, Cr, W, Fe, Zr, Pt, Mo, Co, Ni and Sb. According to the lithium ion battery negative electrode, the diamond-like thin film layer is deposited on the surface of the negative electrode active material layer, and the diamond-like thin film layer has excellent electrochemical inertness and conductivity and high mechanical strength, so that occurrence of an unstable SEI layer on the surface of the negative electrode active material is avoided, and the cycling stability of the electrode is greatly improved. The invention also provides a preparation method for the lithium ion battery negative electrode, and the lithium ion battery.