Automatic production line for engine combustion chamber shell

The invention relates to the technical field of combustion chamber shell forming, in particular to an engine combustion chamber shell automatic production line which comprises a machining table, a supporting circular ring is fixedly connected to the top of the machining table and comprises an inner circular ring and an outer circular ring, and four containing frames are arranged at the top of the supporting circular ring in the circumferential direction; and the placing frames comprise an inner frame and an outer frame, and the inner frame and the outer frame are located on the top of the inner circular ring and the top of the outer circular ring correspondingly. When the preheated combustion chamber shell and external parts are transferred to the bottom of the welding shell to be welded, the adjacent placing frames synchronously move to the bottom of the preheating shell; and the next set of combustion chamber shells and external parts are preheated through the preheating mechanism, the influence of preheati