L-shaped laser head underwater sealing device and laser underwater welding device

The invention provides an L-shaped laser head underwater sealing device and a laser underwater welding device, relates to the technical field, and aims to solve the technical problem that an existing laser head waterproof sealing device is large in size in the prior art. The device comprises a sealed shell, an L-shaped laser head, a protective lens and an annular air knife device, wherein the L-shaped laser head is arranged in the sealed shell; a protection lens is arranged on the right side face of the sealing shell, the ray end of the L-shaped laser head faces the protection lens, and an annular air knife device matched with the protection lens is installed on the sealing shell. The right side face of the sealing shell forms an installation face used for being connected with a drainage cover, and the top face of the sealing shell forms a cable installation face. Compared with a conventional I-shaped laser head, the L-shaped laser head is arranged in the underwater sealing device, the occupied space is small