Pipeline butt-joint

The utility model discloses a pipe mouth matching device which comprises one or more groups of connecting splints which are evenly disposed at outside wall of each end of the pipe which is to be connected, a chain containing groove which is provided at each end of each connecting splint, a chain wheel gear device which is arranged in each chain containing groove, two paralleled chains which respectively go through two opposing chain containing groove at both ends of each connecting splint to be mounted on the outside wall of the pipe which is to be connected, four guide wheel groups which are respectively connected with one end of the chains, and a tension device which is arranged between the four guide wheel groups. The utility model utilizes a hydraulic cylinder to strain or release the chain while the connecting splint of the chain can assure that the rigid stress points of the end of the pipe is centered, and the chain wheel gear device makes the chain in flexible connection with the connecting splint while the guide wheel which is connected with the hydraulic cylinder has two functions among which the first function is to keep the chain move on the surface of the pipe to prevent the bending moment on the plunger when the chain is being strained and the second function is to be the hooker of the wideband chain.