Assembly method of optical assembly, optical assembly and camera module

The invention provides an assembling method of an optical assembly and the optical assembly. The optical assembly comprises a first sub-module and a second sub-module. The first sub-module comprises a first lens barrel and a first lens group arranged in the first lens barrel, wherein the first lens group and the first lens barrel are respectively provided with a first main embedding structure and a first auxiliary embedding structure. The second sub-module comprises a second lens barrel and a second lens group arranged in the second lens barrel, wherein the second lens group and the second lens barrel are respectively provided with a second main embedding structure and a second auxiliary embedding structure. The first auxiliary embedding structure and the second auxiliary embedding structure are matched to form an auxiliary embedding part, and the first main embedding structure and the second main embedding structure are matched to form a main embedding part. A camera module is also provided. 本发明提供一种光学组件的组装方法