Optical module and assembling method thereof

The invention relates to an optical module and an assembling method thereof.The optical module comprises a shell, a pull ring assembly, an optical assembly and a circuit board assembly, an optical interface and an electrical interface are formed at the two opposite ends of the shell, the shell comprises a bottom wall and two side walls, cantilever containing grooves are formed in the side walls, each cantilever containing groove comprises a groove bottom, an upper groove wall and a lower groove wall, a stroke limiting groove is formed in the lower groove wall; the pull ring assembly comprises two cantilevers and a cantilever connecting part, handles and bosses are arranged at the ends of the cantilevers, and the bosses and the cantilever connecting part are arranged in an inclined opposite mode with the cantilevers as reference; the cantilever is arranged in the cantilever containing groove, the boss is arranged in the stroke limiting groove, and the cantilever connecting part is arranged on the outer surface