NOVELTY - Preparation of carbon coating alloy nano-particle electrode material for lithium ion battery, involves: (a) using liquid phrase revivification method to prepare alloy nano-particle; (b) then using hydrophobic reagent to proceed the alloy particle to make it hydrophobic; (c) adding surfactant into water solution, hydrophobic alloy nano-particle, initiator, resorcinol and formaldehyde; and (d) high temperature calcining and carbonizing the product under inert atmosphere.    USE - Preparation of carbon coating alloy nano-particle electrode material for lithium ion battery (claimed).    ADVANTAGE - The alloy nano-particle is coated uniformly and fixedly by carbon with favorable conductivity and a certain swelling property and contractibility, so it can buffer the volume to swell and meanwhile it can ensure conductivity of the whole electrode. Adopting this composition to be as negative pole material of lithium ion battery can obtain negative pole material of lithium ion battery with high lithium storage, excellent security and excellent circulation property.    DETAILED DESCRIPTION - Preparation of carbon coating alloy nano-particle electrode material for lithium ion battery, involves: (a) using liquid phrase revivification method to prepare alloy nano-particle, grain size of the particle is 10-50 nm; (b) then using hydrophobic reagent to proceed the alloy particle to make it hydrophobic; (c) adding surfactant into water solution, hydrophobic alloy nano-particle, initiator, resorcinol and formaldehyde, using micro latex to coat uniformly alloy nano-particle with phenol formaldehyde resin; and (d) high temperature calcining and carbonizing the product under inert atmosphere to obtain alloy nano-particle coated by carbon; where the alloy nano-particle is one or mixture of many duality alloy materials which can be enchased with lithium: Cu6Sn5, Mg2Sn, CoSn, Ni3Sn4, CeSn3 or Ni3Sn2; hydrophobic reagent is one or mixture solution of many of hydrosulfuryl ethyl acetate, ethanethiol, hexadecanethiol, and dodecanethiol; temperature of the high temperature calcining is 600-900 degrees C, and carbon content of the obtained alloy nano-particle coated by carbon takes 10-30% the whole weight of the composition. An INDEPENDENT CLAIM is a coating alloy charging particle electrode material according to carbon prepared by the method.