The invention relates to a method of synthesizing active material of lithium battery anode, specially a phase transfer synthesizing method that synthesizes doped LiMn2O4 powder by doping one or two of the elements: Ni, Ca, Co, Ti, Ga, etc. (1) using lithium acetate, Mn salt and nitrates of doping elements as main material, using organic white oil and CTAB as auxiliary material; (2) preparing the main material according to chemical formula of object product into solution in a reaction kettle, and making synthetic reaction by stirring at 70deg.C-80deg.C; (3) adding CTAB and white oil in a proper bulk ratio to resultant system, keeping temperature and stirring for 0.5 hour, then placing still, separating phase, discarding water phase, drying, cauterizing at 800 deg.C-850 deg.C for 12-15 hours in box electric cooker, cooling with the cooker, and then grinding and scattering to obtain the doped-LiMn2O4 active powder material with stale structure and good electrochemical performance. The method is simple to operate, and the synthetic product has good electrochemical performance.