The utility model provides a lathing clamping structure for thin-wall parts. The lathing clamping structure for the thin-wall parts can achieve fast clamping of workpieces, is convenient to disassemble, greatly improves machining efficiency, and comprises a mandrel, wherein one end of the mandrel is clamped by lathe clamping claws, a workpiece to be machined is sleeved on the mandrel, and the end surface of one side of the workpiece is axially positioned by a positioning ring surface of the mandrel. The lathing clamping structure for the thin-wall parts is characterized in that two L-shaped clamping grooves are formed in the surface of the mandrel in the axial direction, and a locking rod is installed in each L-shaped clamping groove.