A nozzle of a cleaner comprising: a nozzle main body having a suction flow path through which air is suctioned; a first rotation cleaning unit and a second rotation cleaning unit spaced apart in a left and right direction on a lower side of the nozzle main body, each of the first rotation cleaning unit and the second rotation cleaning unit including a rotation plate (420, 440) to which a mop is attachable; a water tank detachably mounted on an upper side of the nozzle main body and configured to store water to be supplied to each of the first and second rotation cleaning units (40, 41); and a water supply flow path provided in the nozzle main body and communicating with the water tank so as to supply water from the water tank to each of the first and second rotation cleaning units (40, 41), characterized in that the nozzle further comprises: a first driving device disposed on one side of a flow path extending in a front and rear direction in the suction flow path and including a first driving motor for driving the first rotation cleaning unit; a second driving device disposed on the other side of the flow path extending in the front and rear direction in the suction flow path and including a second driving motor for driving the second rotation cleaning unit; a first sensing unit configured to sense a rotation speed of the first driving motor; a second sensing unit configured to sense a rotation speed of the second driving motor; and a control unit configured to receive the rotation speeds of the first and second driving motors (182, 184) sensed by the first and second sensing units (361, 362) and control the rotation speeds of the first and second driving motors (182, 184). a nozzle main body having a suction flow path through which air is suctioned; a first rotation cleaning unit and a second rotation cleaning unit spaced apart in a left and right direction on a lower side of the nozzle main body, each of the first rotation cleaning unit and the second rotation cleaning unit including a rotation plate (420, 440) to which a mop is attachable; a water tank detachably mounted on an upper side of the nozzle main body and configured to store water to be supplied to each of the first and second rotation cleaning units (40, 41); and a water supply flow path provided in the nozzle main body and communicating with the water tank so as to supply water from the water tank to each of the first and second rotation cleaning units (40, 41), characterized in that the nozzle further comprises: a first driving device disposed on one side of a flow path extending in a front and rear direction in the suction flow path and including a first driving motor for driving the first rotation cleaning unit; a second driving device disposed on the other side of the flow path extending in the front and rear direction in the suction flow path and including a second driving motor for driving the second rotation cleaning unit; a first sensing unit configured to sense a rotation speed of the first driving motor; a second sensing unit configured to sense a rotation speed of the second driving motor; and a control unit configured to receive the rotation speeds of the first and second driving motors (182, 184) sensed by the first and second sensing units (361, 362) and control the rotation speeds of the first and second driving motors (182, 184). a first driving device disposed on one side of a flow path extending in a front and rear direction in the suction flow path and including a first driving motor for driving the first rotation cleaning unit; a second driving device disposed on the other side of the flow path extending in the front and rear direction in the suction flow path and including a second driving motor for driving the second rotation cleaning unit; a first sensing unit configured to sense a rotation speed of the first driving motor; a second sensing unit configured to sense a rotation speed of the second driving motor; and a control unit configured to receive the rotation speeds of the first and second driving motors (182, 184) sensed by the first and second sensing units (361, 362) and control the rotation speeds of the first and second driving motors (182, 184).