The invention relates to a preparing method of a nickel-manganese-base lithium ion battery anode material, in particular to a preparing method for submicron particles for the nickel-manganese-base lithium ion battery anode material. The technical problems that a material obtained through an existing preparing method for the nickel-manganese-base lithium ion battery anode material is large in particle size and poor in electrical property are solved. The preparing method includes the steps that according to the chemical formula Li (MxNiyMn1-x-y) O2, a electrostatic spinning precursor solution is prepared through metal nitrates, N, N-dimethyl formamide and polyvinylpyrrolidone; the electrostatic spinning precursor solution is spun into nano-fibers through an electrostatic spinning machine, and the nano-fibers are calcinated to obtain the submicron particles for the nickel-manganese-base lithium ion battery anode material. The particle diameter of the submicron particles is 50 nm-200 nm, the specific discharge capacity under the condition of 1000 mA/g large current reaches 110 mAh/g, and only differs from that under the condition of 20 mA/g current by 39.3 mAh/g. The submicron particles for the nickel-manganese-base lithium ion battery anode material can be used in a high-power lithium ion battery.