Iron pipes, fittings connect, to tighten or loosen the tool. Chain pipe clamp. It contains the clamp handle and hinged at one end and clamp the chain handle, front handle clamp with teeth meshing with the chain. Further, through the chain link plate hinged handle with clamp, one end of the chain link plate with one end hinged to link board and clamp the other end of the handle hinge. Clamp handle the front of the teeth was circular distribution. The chain-type pipe wrench at work, non-hinged end of the chain is free, not fixed or hinged handle with clamp, pipe clamp, pipe fittings and rotation by the chain wrapped around it to achieve the friction between the , and torque from the front of the local roller clamp handle the chain meshing with the force generated in the pipe clamp handle the role of the surface point of no force. Therefore, the present invention described in the chain to overcome the existing pipe clamp pipe clamp chain inadequacies, not only on the metal tube, but also on the ceramic tube, thin-walled pipe, plastic pipe fittings, etc. folders support, rotation, does not have bite marks, no damage to pipe surfaces.