The utility model discloses a prefabricated cable calandria connecting catheters, including first pipe and second pipe that splices into the pipe, at least four fastening device of group, fastening device includes connecting rod, buckle body and box body, and the length of buckle body top surface is greater than the length of bottom surface, and the connecting rod is connected with the top surface of buckle body, and the box body is equipped with inner chamber and top surface opening, and the opening part of box body is equipped with and stretches into interior intracavity just to two cards of centrally -inclined. The utility model has the advantages that: save construction processes such as formwork, assembling reinforcement, concrete maintenance, reduced construction site work volume to installation in succession once only.