Hydraulic shrink head correcting device

The utility model discloses a hydraulic shrink head correcting device comprising a shrink head case positioning rack. The upper end surface of the shrink head case positioning rack is provided with a positioning groove corresponding to a shrink head case; the center of the shrink case positioning rack is provided with a checking hole sharing the same shaft with a shrink head; right under the checking hole is a hydraulic machine; the hydraulic machine is connected with a hydraulic rod sharing the same shaft with the checking hole; the hydraulic rod passes through the checking hole; a positioning cap with the same shaft as the hydraulic rod is fastened on the top part of the hydraulic rod; and the external diameter of the positioning cap is matchable with the internal diameter of a central casting pipe. By the use of the hydraulic shrink head correcting device, centering of the shrink head to the central casting pipe can be quickly finished with convenience and accuracy, so work efficiency of shrink head correc