Handheld laser welder adopts continuous fiber laser source, and is equipped with self-developed hand-held welding head. In terms of shape, structure and human-machine interface, it is optimized based on humanization and work effectiveness. The hand-held welding joint can be customized according to actual production, which is not often used in non-standard production. It adopts water cooled design, long-time welding without burning, small diameter and hand-held easily. It has the advantages of simple operation, beautiful welding effect, fast welding speed and no consumables.