The utility model relates to a
laser welding tool for a distribution cavity. The
laser welding tool comprises a tool base, the rotary chuck is arranged on the tool base and is used for limiting the
hydrogen pipe joint; the positioning and clamping device is rotatably connected to the side, close to the rotary chuck, of the
tailstock and comprises a supporting plate, a
tailstock is fixed to the supporting plate, a containing space is formed between the
tailstock and the supporting plate, and the
hydrogen distribution cavity can be contained in the containing space; and the tailstock is movably arranged on the tool base. According to the distribution cavity
laser welding tool, the
hydrogen distribution cavity and the hydrogen
pipe connector can be preliminarily limited by the positioning and clamping device and the rotating chuck correspondingly,
butt joint and clamping between the hydrogen distribution cavity and the hydrogen
pipe connector can be completed through the displacement tailstock, and the hydrogen pipe connector and the hydrogen distribution cavity can be rotated by being matched with the rotating chuck; and the rotating requirements on the hydrogen distribution cavity and the hydrogen pipe joint during laser welding are met.