The invention provides a negative electrode for a lithium secondary battery, a preparation method thereof and a lithium secondary battery, and belongs to the field of chemical power sources. The negative electrode mainly consists of a convex array electrode skeleton, a nano-scale alloy skeleton and active metal lithium, the material of the large-aperture convex array electrode skeleton is any oneof Cu, Al, Sn, Fe, Co, Ni, Zn and In, the nano-scale alloy skeleton comprises a lithium element and a non-lithium element, the material of he the non-lithium element comprises at least one of Sn, Si,Cu, In, Al, Mg, Ge, Zn, Ni, the active metal lithium is filled in the pores of the nano-scale alloy skeleton and is fully contact with the nano-scale alloy skeleton to form a lithium-rich alloy, and the lithium-rich alloy is deposited in the pores of the convex array electrode skeleton. The negative electrode provided by the invention can prevent the collapse of the electrode due to the structuraldamage of the nano-scale skeleton in a long-term circulation process, fully inhibit the volume change of the electrode to improve the interface stability, and further improve the electrochemical performance of the lithium negative electrode.