Telescopic ventilating duct

The utility model provides a telescopic ventilating duct, and belongs to the technical field of ventilating ducts. The telescopic ventilation pipeline comprises a single pipe and a telescopic connecting mechanism, a mounting frame is mounted on the right side of the surface of the single pipe, a telescopic pipe is movably connected to the left side of the interior of the single pipe, a connecting frame is fixedly connected to the left side of the surface of the telescopic pipe, and a bolt is movably connected to the left side of the connecting frame; the outer side of the sealing frame makes contact with the inner wall of the single pipe, the telescopic supporting mechanism is fixedly connected to the left sides of the front side and the rear side of the single pipe, and by arranging the telescopic connecting mechanism, when multiple pipes are installed and connected by a worker, a medium for telescopically adjusting the length of the single pipe is provided for the worker, and the worker can conveniently adj