Large-scale casting type screw thread embedding and blocking restoring tool and large-scale casting type screw thread embedding and blocking restoring method

The invention relates to a large-scale casting type screw thread embedding and blocking restoring tool and a large-scale casting type screw thread embedding and blocking restoring method. The tool consists of a guide head, a steel wire screw sleeve, a sleeve, a screwing core rod and a handle through being sequentially connected in series, wherein the guide head is provided with taper-shaped internal screw threads, one end of the sleeve is provided with a notch, the handle is arranged at one end, far away from the steel wire screw sleeve, of the screwing core rod, and one end, near the handle, of the screwing core rod, is provided with the screw threads. The restoring method comprises the following steps that the drilling, chamfering and screw thread tapping are carried out; the steel wire screw sleeve is placed into the sleeve; the screwing core rod passes through the steel wire screw sleeve so that the notch clamps the steel wire screw sleeve; the handle rotates so that the screwing core rod drives the steel