The invention relates to a silicon cathode of a lithium ion secondary battery. The silicon cathode comprises a conductive substrate and a material layer applied to the surface of the conductive substrate, wherein the material layer comprises at least two conductive material layers and at least one silicon-based material layer, the conductive material layers are attached to the conductive substrate, the silicon-based material layer and the conductive material layers are arranged at intervals, and the silicon-based material layer is positioned between the two conductive material layers. The lithium ion secondary battery prepared by adopting the silicon cathode has good volume specific capacity and good circulation performance.