The invention relates to an anodic oxidation method of a welding structure and application thereof. The anodic oxidation method of the welding structure comprises the following steps of providing thewelding structure, wherein the welding structure is provided with a welding surface, and a welding line is formed in the welding surface; forming an aluminum layer on the welding surface, wherein thealuminum layer completely covers the welding surface; and performing the anodic oxidation treatment on the welding structure where the aluminum layer is formed. According to the anodic oxidation method of the welding structure, an oxide layer with uniform thickness and uniform color can be obtained.