Abstract: Fixed buckle of the Φ219 mm push bench pipe mill has complex structure and high processing cost, and when changing the mandrel size, heavy workload and high time consumption are required.Accordingly the structure of the fixed buckle is improved, getting the original three individual fixed buckles modified into a monolithic structural one.Operation result of the designed fixed buckle shows advantages such as tremendous reduction of quantity of the buckle bolts as dismounted when changing the mandrel size, shortening of the time for production preparation, cutting down the labor intensity, and enhancement of the operation efficiency.Moreover since the surrounding area between the one-piece fixed buckle and the pushing rod is increased, the stability of the mandrel as running during the pushing process is significantly improved.The modification shall make the pipe mill fully adapting to production with multi types and small lots.