The invention discloses a special tooling for turning high-precision thin-wall cylinder liner bores, which comprises an internal taper sleeve, an elastic clamp and an axial positioning disk, the left end of the internal taper sleeve is connected with a spindle
flange, the right end of the internal taper sleeve is connected with the axial positioning disk, the right side of the internal taper sleeve is provided with a taper hole, the taper hole is connected with a cylindrical hole of the left side, the sidewall of one side of the cylindrical hole is provided with a guide hole, a vent hole is formed in the left side of the guide hole, the elastic clamp comprises an internal cylindrical hole and an external
conical surface, the external
conical surface is connected with an external cylindrical surface, a pull rod holder is arranged on the external cylindrical surface, the pull rod holder is provided with a pull rod-fixing hole, a
washer is arranged at the right side of the pull rod-fixing hole, the outer
diameter of the
washer is greater than the inner
diameter of the pull rod-fixing hole, the excircle of the end of an oil cylinder pull rod is matched with the pull rod-fixing hole, the end of the oil cylinder pull rod is provided with a threaded hole, and the oil cylinder pull rod is connected with the
washer. The structural precision of the special tooling is high, a thin-wall cylinder liner can be positioned and clamped reliably, clamping stress is uniform, the deformation of the thin-wall cylinder liner caused by clamping force is reduced, and the precision requirement of workpieces is met.