High-speed rail tunnel cavern leading-in branch tail cable

The utility model discloses a high-speed rail tunnel cavern leading-in branch tail cable. Comprising a connector box and an optical cable cross-connecting cabinet. The input optical fiber is inserted into the connector box, and one end of the input optical fiber is provided with a plurality of functional optical fibers which are wound in the connector box; the station functional optical fiber to be accessed is welded with the distribution optical cable, and the distribution optical cable is welded with one end of the tail cable branch joint; the remaining functional optical fibers are connected with a connector box connector of a next station; the branch end of the tail cable branch joint extends into the optical cable cross connecting box to be accommodated; and the branch ends of the tail cable branch joints are respectively and electrically connected with the station equipment in an inserting manner. The device can reduce the number of main optical cable optical fiber welding joints, reduce optical cable l