The invention discloses a preparation method of a spherical nickel-lithium manganate anode material. The preparation method is characterized by comprising the following steps: weighing a lithium source compound, a nickel source compound and spherical manganous-manganic oxide by a mol ratio of 2:1:1; dissolving the lithium source compound and the nickel source compound in ethanol to prepare a solution of which the total concentration of metal cation is 0.1-0.3 mol/L; adding the spherical manganous-manganic oxide into the solution; heating the solution in a water bath with stirring until a paste-like mixture is formed; drying the paste-like mixture at 90-110 DEG C to obtain gray black powder; roasting the obtained powder at 750-950 DEG C for 6-36 hours; annealing at 615-675 DEG C for 2-6 hours; cooling, directly sieving, and then obtaining the nickel-lithium manganate anode material. The lithium source compound is lithium acetate or lithium nitrate, and the nickel source compound is nickel acetate or nickel nitrate. The water-bath heating temperature is 50-70 DEG C.