The utility model relates to a laser pneumatic multi-needle bundle gun combined machining device which is characterized by comprising a conduction optical fiber, an optical path cavity, a laser welding head and a pneumatic device, wherein the optical path cavity is connected with the conduction optical fiber; the laser welding head is connected with the optical path cavity; the pneumatic device is connected with the laser welding head by a connecting piece. The laser pneumatic multi-needle bundle gun combined machining device has the following advantages that: 1, the laser pneumatic multi-needle bundle gun combined machining device has a simple integral structure, is convenient to operate and is low in cost; 2, the laser pneumatic multi-needle bundle gun combined machining device has a simple equipment relation with parts, and a pneumatic multi-needle bundle descaling gun is arranged by ingenious design on the basis of the original laser welding head, is connected with the laser welding head and is regulated in real time by the connecting piece so as to meet the requirements of various positions; 3, according to the utility model, a laser welding process is reinforced, weld joint quality and production efficiency are improved, and the laser pneumatic multi-needle bundle gun combined machining device is suitable for any laser welding process, has a wide application range and is convenient for large-scale popularization and use.