A mop includes a spinning device, a shank fixed to a first end of the spinning device, an operation rod having a first end connected to a second end of the spinning device, and a mop head connected to a second end of the operation rod. When a force is applied in a first direction making the operation rod and the spinning device move relatively in an axial direction, the mechanism in the spinning device drives the operation rod and the mop head to spin in the same direction simultaneously so as to generate a centrifugal force to remove the water from the mop head. When the force stops, the spring and the clutch structure in the spinning device make the operation rod back to the original position under a condition that the operation rod does not spin.