An air electrode, executes the multilayer sintering structure, is composed of at least one layer of base material, two layers of diffused layer and an activating layer coincidence. The base material is the current collector of the air electrode and is made of the metal gauze or metal blister gauze, the upper and the lower sides respectively superpose at least a diffused layer sintered by hydrophobicity carbon material, superpose at least a activating layer outside the diffused layer, every activating layer is sintered by hydrophilicity carbon material adhered with transition metal oxide catalysis; this air electrode can be applied to zinc air battery, negative pole of firing battery or capacitance, especially when applied to the negative pole of zinc air battery, it can avoid the external air influence on the electrolyte in the zinc air battery, in the dry environment, it can maintain the water ratio of zinc positive pole of air battery more than one month, and maintain the stable electric performance.