The invention relates to a novel sufficient metal air battery oxygen electrode and a preparation method thereof, belongs to a high performance chemical electric power source and the relative field. The oxygen electrode and the preparation method can be used for solving technical problems of eliminating the phenomenon that a reaction is stopped caused by an oxidative product deposits on a gas path when metal is discharged, the reaction efficiency and loop stability of the oxygen electrode of a chargeable metal air battery are effectively improved, a three-phase reaction interface is reduced, and poison of moisture in the air to an electrode reaction and corrosion to an electrode are reduced. In the technical scheme provided by the invention, a gas micro channel is adopted to reduce moisture in the air, a gas distribution plate is used for improving airflow direction and a gas distribution state, a hole carbon material and an array materials combine to form a high efficiency three dimensional electrode, and a cathode reaction chamber is separated from a metal anode through a diaphragm. The oxygen electrode provided by the invention has the advantages of high catalytic reaction efficiency, good loop stability, short diffusion distance of gas and metallic ions, full air liquid solid three-phase contact; and unblocked gas path, reasonable gas distribution, strong metal oxide deposition resistance, good mass transferring and diffusion process effect, strong operability, and is suitable for a high energy density power supply occasions in a long term repeatedly.