Clamping tool for thin-wall contracting and expanding part

The utility model discloses a clamping tool for thin-wall contracting and expanding parts, which belongs to the technical field of mechanical tool clamping equipment and comprises a bottom plate provided with a positioning circular truncated cone. A plurality of first pressing plates are arranged; the base plate is provided with a first pressing hole, and a first pressing bolt penetrates through the first pressing hole and is in threaded connection with the base plate; the multiple stand columns are arranged, and circumferential positioning assemblies are arranged on the stand columns and provided with circumferential positioning faces. The pressing ring is arranged at the upper end of the stand column, and a plurality of second pressing plates are arranged on the pressing ring; the second compression bolt penetrates through the second compression hole and is in threaded connection with the compression ring; by means of the positioning circular truncated cone, the first pressing plate, the circumferential pos