The present invention relates to negative-electrode active material for a lithium secondary battery exhibiting excellent capacity property and cycle life property, a method of preparing the same, and a lithium secondary battery using the negative-electrode active material, wherein the negative-electrode active material for a lithium secondary battery comprises a nanotube having a tube shape defined by an outer wall with a thickness of nanoscale, the outer wall of the nanotube comprises at least one non-carbonaceous material selected from the group consisting of silicon, germanium and antimony, and an amorphous carbon layer with a thickness of 5 nm or less is formed on the outer wall of the nanotube.