Non-return structure of smoke exhaust pipeline

The utility model belongs to the technical field of check valves, and particularly relates to a check structure of a smoke exhaust pipeline, which comprises a check valve body fixedly connected with a limit disc and a mounting component. The mounting assembly comprises a movable main body plate, an overturning clamping rod, a first threaded rod, a sliding block and a connecting block; the first threaded rod is installed on the limiting disc in a threaded screwing mode, and the first threaded rod penetrates through the limiting disc and then is rotationally connected with the movable main body plate through a bearing. The two overturning clamping rods are symmetrically hinged to the two ends of the movable main body plate; according to the non-return structure of the smoke exhaust pipeline, the installation assembly is utilized, the overturning clamping rod can be controlled to overturn and move by rotating the first threaded rod and the second threaded rod, the limiting disc is matched to be clamped in a flue