The invention relates to a method for preparing battery raw materials by using electrolytic manganese anode mud and a product thereof. The method comprises the following steps of: drying the collected electrolytic manganese anode mud; then, sufficiently mixing the collected electrolytic manganese anode mud and an 2mol/L H2SO4 solution, and the ratio of the dried anode mud and the H2SO4 solution is 1g:5-10mL; next, carrying out solid-liquid separation to remove sulfate ions; drying solids; adding iron liquid into the dried solids; and evenly mixing. The product is a battery raw material with active manganese dioxide according to the method. The apparent gravity of the battery raw material reaches 1.73-2.04g/cm3, and the content of the active manganese dioxide is above 78.8 percent. The method of the invention has low integrated cost, is easy to operate, is beneficial to environmental protection and is especially beneficial to the industrialized production of electrolytic manganese production plants. The product can completely replace various kinds of manganese dioxide in the prior art as the battery raw materials and save a great deal of resources naturally.