Self-cleaning ventilating duct

The utility model discloses a self-cleaning ventilating duct which comprises a cleaning frame, a cleaning structure and a guide supporting structure. Rubber wheels are rotationally connected into mounting openings uniformly formed in the four edges of the outer surface of the cleaning frame through pin shafts, the rubber wheels are slidably connected with the inner wall of the ventilation pipeline, a supporting frame is arranged in an inner cavity of the cleaning frame, and ventilation holes are uniformly distributed in a frame body of the supporting frame; the cleaning structure is arranged on the front surface of the cleaning frame; the guide supporting structures are symmetrically arranged at the upper and lower ends of the rear surface of the cleaning frame; the self-cleaning type ventilating duct further comprises handrails, the handrails are symmetrically arranged on the left side and the right side of the rear surface of the supporting frame, the comprehensiveness of cleaning of the inner wall of the v