Clamp device suitable for thin-wall pipe fitting machining

The utility model discloses a clamp device for machining a thin-wall pipe fitting. The clamp device comprises an end part clamping mechanism and a middle bearing mechanism, the end clamping mechanism is provided with a clamping disc for positioning the end face of the thin-wall pipe fitting, an inner hole of the clamping disc is fixed to a numerical control machine tool chuck, the end face of the clamping disc is provided with a positioning ring extending into the thin-wall pipe fitting, a groove is formed in the positioning ring, the bottom face of the groove is a slope face, a positioning block is arranged in the groove, and the positioning block is provided with an inclined face matched with the slope face to slide. The positioning screw rod is pulled to drive the positioning block to move along the slope surface, so that the inner wall of the thin-wall pipe fitting is locked; a locking claw is arranged on the outer edge surface of the clamping disc and is used for locking the outer wall of the thin-wall p