The invention discloses a welding structure for an optical module and application thereof. The optical module comprises at least one first module assembly and at least one second module assembly, thewelding structure comprises at least one first welding piece and at least one second welding piece, wherein the first welding piece is disposed in the first module assembly, the second welding piece is disposed in the second module assembly. After the first welding piece and the second welding piece are welded, the first module assembly and the second module assembly are fixed relative to each other.