Sunken inner flange deformation repairing device

A sunken inner flange deformation repairing device comprises a support, a rotating shaft is rotationally installed in the support, a radial telescopic device is detachably installed at the upper end of the rotating shaft, the lower end of the rotating shaft is in transmission connection with a first driver installed on the support, and a longitudinal adjusting device is installed at the telescopic end of the radial telescopic device. The second driver is mounted on the longitudinal adjusting device, and an output shaft of the second driver extends downwards and is provided with a cutter; and the second driver and the cutter can do up-down and radial telescopic motion through the radial telescopic device and the longitudinal adjusting device. By means of the structure, cold machining repairing can be conducted on the deformed sealing face under the condition that the flange is not replaced, and the advantages of being fast in repairing process, high in machining precision, flexible and convenient to install an