Tensioning lead screw thread repairing device

The utility model discloses a tensioning lead screw thread repairing device which comprises a machine table, a movable sliding table is arranged on the inner side of the end portion of the machine table in a sliding mode, an installation bottom plate is installed on the left side of the end portion of the machine table, and a thread repairing driving component is arranged at the end portion of the installation bottom plate. The head of the tensioning screw rod penetrates into the rectangular die threading die and the hollow shaft piece, meanwhile, the motor and the speed reducer are started to rotate forwards and backwards, at the moment, inner teeth of the rectangular die threading die and the outer edge of threads of the tensioning screw rod are reamed for repairing, and forward rotation and backward rotation are repeated till the tensioning screw rod stretches out of the hollow shaft piece; the positions, needing to be repaired, of the threads of the tensioning screw rod are all repaired, then the tensioni