Disclosed is a welding structure (20) for an optical module (300) and an application thereof, wherein the optical module (300) comprises at least a first module assembly and at least a second module assembly, the welding structure (20) comprises at least a first welding part (21) and at least a second welding part (22), wherein the welding part (21) is provided on the first module assembly and the second welding part (22) is provided on the second module assembly, and after the first welding part (21) is welded to the second welding part (22), the first module assembly and the second module assembly are fixed relative to each other.