An engine shell is a cylindrical thinwalled shell part with large aspect ratio. Using spinning forming, the inner diameter error is large and the roundness is poor, and the precision of the welded product is required higher.In view of the above characteristics,a laser hybrid welding equipment was developed, and a multiunit linkage laser hybrid welding equipment framework for high strength steel shell with large aspect ratio was proposed.The influence law of welding parameters such as laser power, wire spacing and welding speed on welding quality was revealed. An integrated control software with multisystem coordinated control was developed.Key technologies such as high precision positioning and clamping technology for spinning shell parts and distributed selfadapting automatic circular support technology had been broken through. The problems of clamping, positioning and selfadapting circular support of the large aspect ratio spinning shell parts with large inner diameter tolerance were solved, and the laser hybrid automatic welding of high strength steel shell circumferential seam was realized