The invention relates to a method for preparing a high-tap-density spherical lithium-rich manganese-based anode material. The method is characterized by including the following steps: (1) calculating and weighing soluble nickel salt, cobalt salt, manganese salt and a crystal growth control agent based on an elemental ratio according to a predetermined product formula xLi [Li1/3Mn2/3] O2*(1-x) LiMO2 to prepare solution A with nickel-cobalt-manganese mixed concentration of 0.5-5mol/L and crystal growth control agent concentration of 0.05-0.5mol/L, wherein M is Ni, Co or Mn and x is smaller than 1 and larger than 0; (2) preparing solution B with sodium carbonate concentration of 0.5-2.5mol/L and complexing agent concentration of 0.05-2.5 mol/L by using deionized water; (3) reacting the solution A and the solution B in a parallel flow manner at low temperature, and aging obtained deposit; (4) filtering, washing by deionized water and oven-drying the deposit to obtain a dry high-tap-density spherical carbonate precursor; and (5) preparing a material according to the ratio of the precursor and the lithium carbonate of 1 and 0.58- 0.64, uniformly mixing the material, and then sintering the material in an oxidizing atmosphere.