A spin-dry mop comprising a rotatable mop rod, a cleaning body, an outer cover and a fixing sleeve; the rotatable mop rod comprises an upper tube, a lower tube and a rotating driving mechanism; the upper tube and the lower tube are movably connected through the rotating driving mechanism; the upper tube and the lower tube can move up and down relative to each other, and can rotate relative to each other; the cleaning body is connected to the lower tube; the outer cover is sleeved outside the lower tube, and can move up and down along the lower tube; the fixing sleeve is fixedly connected with the upper tube; the spin-dry mop further comprises a locking mechanism used for locking the rotatable mop rod.