Dust cleaning mechanism for exhaust fan

The utility model relates to the technical field of cleaning mechanisms, in particular to a dust cleaning mechanism for an exhaust fan, which comprises a pulley mechanism, a stabilizing mechanism and a cleaning mechanism, the cleaning mechanism is arranged at the top of the pulley mechanism, the stabilizing mechanism is fixedly arranged on one side of the cleaning mechanism, and the pulley mechanism comprises a pulley support, a brake frame and universal wheels. Brake frames are fixedly arranged at the bottoms of the pulley supports, and universal wheels are fixedly arranged at the bottoms of the brake frames. A mounting circular ring, a connecting circular ring, a fixing bolt and a driving motor are fixedly arranged on one side of an exhaust fan in an internal square fixed shell of the cleaning mechanism, and the driving motor drives a driving rotary column, a rotating motor, a spiral blade, a liquid inlet valve of a water tank, a liquid discharging valve, a booster water pump, a flow dividing water pipe and