The invention relates to the field of workpiece clamping devices, in particular to a turning clamping device. The turning clamping device comprises a drive mechanism, a clamping mechanism, and a limiting mechanism. The drive mechanism comprises a shaft and a shaft sleeve which are fixedly connected through flush bolts. A slant is arranged on the shaft sleeve. The clamping mechanism comprises a clamping claw, a floating shore, and a centering disc. One end of the clamping claw is hinged with a support contacted with the slant of the shaft sleeve. The other end of the clamping claw is contacted with a workpiece and capable of clamping the workpiece by turning inward. The floating shore is arranged on the base seat. The upper end of the floating shore is arranged on the base seat. The centering disc is arranged on the base seat. The limiting mechanism comprises an upper split ring and a lower split ring. The upper split ring is arranged on the base seat. The lower slit ring is arranged on the shaft sleeve. The turning clamping device is capable of clamping the workpiece stably and leveling the workpiece at the same time.