The invention is applicable to the field of lithium battery anode materials and provides a lithium battery nickel-cobalt lithium manganate ternary anode material and a preparation method thereof. The preparation method comprises the following steps: preparing two groups of nickel-cobalt lithium manganate materials of different nickel contents; preparing a coating material from an aluminum salt and sol with a coating element; uniformly mixing the two groups of the prepared nickel-cobalt lithium manganate materials according to a certain mass ratio, further mixing with the coating material, and sintering in a tank type furnace, thereby obtaining the nickel-cobalt lithium manganate ternary anode material. As the nickel-cobalt lithium manganate materials of different nickel contents are mixed, the specific capacity of the material is increased; and as the surface of the material is coated by the coating material with at least one element of Zr, Mg, Ti, Ce, La, Nb, Ba, V, Ni, Co, Mn and Al, the circulation property of the material can be improved. The material is simple in preparation process and is capable of ensuring excellent and stable product properties.