The invention discloses a method for preparing highly oxidized lead powder from a waste battery lead plaster, which comprises the following steps: (1) grinding a waste lead plaster into powder; (2) adding a sulfuric acid solution and reducer into the lead plaster powder, sufficiently reacting, separating to remove the liquid, washing the solid material to neutral with water, and baking; (3) adding desulfurizer into the solid material obtained in the step (2), sufficiently reacting, separating to remove the liquid, washing the solid material to neutral with water, and baking; (4) adding an acid solution into the solid material obtained in the step (3), sufficiently reacting, removing the insoluble impurities to obtain a lead-containing solution, adding carbonate into the solution, sufficiently reacting, removing the liquid, washing the solid with water, and baking to obtain a pure lead carbonate solid; and (5) calcining the lead carbonate solid obtained in the step (4) in a muffle furnace to obtain the highly oxidized lead powder. The method has the advantages of low preparation cost, simple technical process and high lead recovery rate and quality, and can obviously lower energy consumption and reduce environmental pollution.