The invention relates to a claw for thin-walled workpiece processing. The claw comprises a chuck body, wherein three main claw chutes are formed in the chuck body, a thread disc is arranged in the chuck body, main claws are arranged in the main claw chutes, the upper part of a tooth-shaped moving body of each main claw is connected with a corresponding claw body into a whole through a dovetail groove, teeth at the lower part of each tooth-shaped moving body are meshed with vortex-line-shaped tooth space on the end surface of the thread disc, bevel gear mounting holes are formed in the side wall of the chuck body, bevel gears are arranged in the bevel gear mounting holes and meshed with the tooth space of the thread disc, an auxiliary claw is arranged between two adjacent main claws, each auxiliary claw screw rod is placed in a circular arc groove of each auxiliary claw base and matched with a corresponding auxiliary sliding claw, and a copper protective layer is arranged on the clamping surface of each claw body and each auxiliary sliding claw. The claw can clamp the workpiece more stably and can effectively protect the workpiece from being damaged due to clamping and wearing in a clamping process.