Eccentric flange deformation preventing tooling that takes over belongs to large -scale container manufacturing field, has overcome the prior art defect. Its structure contains support tube assembly,straight angle connection plate subassembly and connecting plate, support tube assembly is three altogether, and vertical one big horizontal two is little, straight angle connection plate subassemblyis totally two, the connecting plate is totally two, respectively with two eccentric flange joint that take over, simultaneously through two little support tube assembly and straight angle connectionplate subassembly and big support tube assembly be connected together. Application method: take over flanges tight with two off -centre respectively with two connecting plates, install two little support tube assembly and two straight angle connection plate subassemblies respectively, through two adjustable little support tube assembly of rotating adjusting bolt and big support tube assembly length, all length and distance reach the whole device of requirement after -fixing, assemble two eccentric flange and equipment casing welded fastening of taking over. Two eccentric difficult problems oftaking over not good control of flange size precision and welding deformation have been solved to this frock, and can be repeatedly utilized.