The invention discloses a rotary cleaning mechanism. The rotary cleaning mechanism comprises a cleaning barrel and a mop, wherein the cleaning barrel comprises a fixed frame, a cleaning basket fixed on the fixed frame as well as a water pumping mechanism and a rotating device which are arranged in the fixed frame. For the conventional cleaning mop barrel in the market, a cleaning rotating device is mainly concentrated in the cleaning barrel but not the mop, so the design and manufacturing cost of the mop is reduced and exchanging cost is reduced; the water pumping device and the rotating device are concentrated on the same driving device, namely a pedal, so the design structure is simplified, and the function of spraying water while rotatably cleaning is realized.