The invention relates to the technical field of machining of thin-walled parts, in particular to a turning tool capable of achieving rapid clamping. The turning tool comprises a base, a lower positioning device and an upper positioning device, wherein the lower positioning device and the upper positioning device are sequentially installed on the base from bottom to top, the turning tool further comprises a driving device, each of the upper positioning device and the lower positioning device is composed of a plurality of supporting blocks, moreover, the plurality of supporting blocks of each ofthe upper positioning device and the lower positioning device are arranged at intervals to form a circular support for the part correspondingly, a fitting surface matched with the inner wall of the part is arranged on the outer wall of each supporting block, the driving device can drive the supporting blocks in the upper positioning device to move synchronously, and can drive the supporting blocks in the lower positioning device to move synchronously. The turning tool achieves positioning through an upper section and a lower section, the circular supports are formed to the part from the innerwall of the part, then the problem that the quality of the part is influenced in the machining process due to insufficient strength of the thin-wall part is solved, the thin-walled part can be quickly clamped, the inner parts are tightly attached, then the cutting parameters can be improved, the production efficiency can be improved, batch machining can be realized, and the mass production chokepoint can be broken through.