NOVELTY - A composite lithium manganate anode material comprises 500 pts. wt. lithium manganate, 1-2 pts. wt. antimony pentoxide, 3-4 pts. wt. magnesium oxide, 2-3 pts. wt. aluminum oxide, 1-2 pts. wt. silicon dioxide, 4-5 pts. wt. modified silver powder and water, where the modified silver powder is prepared by mixing silver powder, nanometer carbon, calcium carbonate powder, phosphoric acid, montmorillonite powder, triallyl cyanurate, smashing sand, tantalum pentoxide and manganese dioxide, heating, grinding and dispersing the mixture to obtain powder, and calcining the powder to obtain the product.    USE - Composite lithium manganate anode material for a lithium ion battery.    ADVANTAGE - The material improves high temperature storage performance, specific capacity and service life of the battery, is non-toxic and stable in quality, and prepared in a simple and economical manner, and does not cause the environmental pollution.    DETAILED DESCRIPTION - A composite lithium manganate anode material comprises 500 pts. wt. lithium manganate, 1-2 pts. wt. antimony pentoxide, 3-4 pts. wt. magnesium oxide, 2-3 pts. wt. aluminum oxide, 1-2 pts. wt. silicon dioxide, 4-5 pts. wt. modified silver powder and proper amount of water, where the modified silver powder is prepared by mixing 100 pts. wt. silver powder, 1-2 pts. wt. nanometer carbon, 2-3 pts. wt. calcium carbonate powder, 2-3 pts. wt. phosphoric acid, 1-2 pts. wt. montmorillonite powder, 1-2 pts. wt. triallyl cyanurate as a cross-linking agent, 1-2 pts. wt. smashing sand, 2-3 pts. wt. tantalum pentoxide and 1-2 pts. wt. manganese dioxide, heating the mixture to 50-55 degrees C and grinding the mixture for 1-2 hours, uniformly dispersing the mixture to obtain powder, and calcining the powder in furnace at 550-580 degrees C for 2-3 hours to obtain the product. An INDEPENDENT CLAIM is also included for a method for preparing a composite lithium manganate anode material, which involves mixing the raw materials of the anode material, grinding the mixture for 2-3 hours to obtain 200-400 meshes slurry, spraying and drying, adding 2-3 wt.% polyethylene wax powder, stirring uniformly and pressing into blank under the pressure of 10-15 Mpa, putting the pressed mixture into a calcining furnace at 720-750 degrees C for 4-5 hours, cooling and crushing the calcined mixture into fine powder of 300-400 meshes to obtain the finished product.