Modularized aluminum alloy framework assembling and welding device

The utility model discloses a modularized aluminum alloy framework installing and welding device which comprises a supporting body and at least two limiting assemblies, the limiting assemblies are arranged on the supporting body in an I shape, and a fixing face which is matched with the arc shape of a workpiece and used for supporting and limiting is formed on the supporting body. The limiting assembly comprises a jacking device, a pressing device, a limiting block and a connecting plate, the jacking device, the pressing device and the limiting block are arranged on the connecting plate through supporting legs, and the lengths of the supporting legs on the same connecting plate are not uniform; a plurality of limiting assemblies formed by the jacking devices, the pressing devices, the limiting blocks and the connecting plates are arranged on the supporting main body, and the fixing face which is matched with the arc shape of the workpiece and used for supporting and limiting is formed on the supporting main b