Straightening jig for precision machining of slender shaft

The invention relates to the technical field of slender shaft precision machining, in particular to a slender shaft precision machining straightening jig which comprises a base, two symmetrically-installed shaft installers are arranged on the base, a plurality of movable pneumatic tables are arranged between the two shaft installers, shaft rolling devices are arranged at the two ends of the base, and a movable electric telescopic table is arranged on one side of the base. A rotatable pneumatic hammer supporting table is arranged on the electric telescopic table, a position-adjustable pneumatic hammer is arranged on the pneumatic hammer supporting table, the electric telescopic table comprises a rotatable mounting table body, the pneumatic hammer supporting table comprises a first mounting seat located on the mounting table body, a shaft seat is arranged on the first mounting seat, and the pneumatic hammer supporting table is rotationally connected to the shaft seat. An extension supporting table is arranged a