The invention provides a dual-section clamping tool for fixing and positioning elbow parts. The clamping tool is provided with a flange plate (7), sliding seats (3) and V-shaped blocks, wherein the flange plate (7) can be connected with a machine tool, the sliding seats (3) are fixedly connected to the flange plate, the V-shaped blocks are fixedly connected to the sliding seats (3) and used for clamping the elbow parts, the sliding seats (3) are symmetrically distributed on the central axis of the flange plate, and connected and fixed to a disc (6) through screw pins, a sliding block (2) passes through sliding grooves on the sliding seats (3) and is slidably connected into the sliding grooves, the upper end of the sliding block (2) is parallel to the two translational V-shaped blocks (1) on the plane of the flange plate (7) and does a horizontal axial motion along with the sliding block, and two rotating V-shaped blocks (8) are movably connected to the sliding block through pin holes on the end surface of the inner side of the sliding block and used for axially positioning and clamping two sections of cylindrical surfaces which are on the same vertical plane with the elbow parts and form an included angle. The clamping tool provided by the invention can be used for positioning and clamping the elbow parts in various angles. The invention solves the problems of more quantity and low cost of clamp tools of a machine tool for machining the elbow parts.