The invention relates to the field of air batteries, and discloses an aluminum air battery. The aluminum air battery comprises a power generating region defined by a hollow reaction pool, wherein an aluminum object, liquid-state metal or liquid-state metal alloy, electrolyte and an air electrode are arranged in the power generating region; in a work state, the aluminum object, the liquid-state metal and the electrolyte are positioned in the power generating region; the aluminum object is soaked into the liquid-state metal; the electrolyte is in contact with the aluminum object soaked into the liquid-state metal; oxygen gas adsorbed by the air electrode is input into the electrolyte; an electrode plate is used for outputting charges. The aluminum air battery provided by the invention has the advantages that an oxide film on the surface of the aluminum object in the aluminum air battery is removed by using the liquid-state metal, so that the aluminum object is activated; the aluminum air battery is triggered to generate electricity; the hydrogen evolution corrosion of the aluminum object can be effectively inhibited; the battery power generation efficiency is improved; the advantages of high-energy-density, high power density and high discharging efficiency are realized; the manufacturing cost is low.