Connecting pipe butt joint structure and inspection well thereof

The utility model relates to the technical field of pipe connecting structures, in particular to a connecting pipe butt joint structure and an inspection well thereof, which comprises a branch pipe and a transition joint, the other end of the transition joint is mutually inserted with the branch pipe, and the transition joint is provided with a flaring part at the inserting section of the branch pipe. When the inspection well is used, the flaring part is arranged on the transition joint, so that the sealing ring is kept in contact with the branch pipe, the transition joint plays a role in bearing, stable and reliable butt joint connection of the butt joint port and the branch pipe is guaranteed, and the situation that the butt joint port on the side of an existing inspection well is directly in butt joint with an external pipeline is avoided; the problems that in the installation process, the butt joint opening and an external pipeline are prone to disengagement, for example, one end of the pipeline is in but