Yacht underwater cleaning device

The invention provides a yacht underwater cleaning device. The yacht underwater cleaning device comprises an on-yacht monitoring unit, an underwater cleaning unit, a connecting cable and a drag rope, wherein the on-yacht monitoring unit can display the working state of the underwater cleaning unit and complete the control of the underwater cleaning unit, the underwater cleaning unit can clear marine organisms and dirt, which are attached on the bottom of a yacht, the connecting cable can provide electrical energy for the underwater cleaning unit and is also a medium for communication between the on-yacht monitoring and control unit and the underwater cleaning unit, and the drag rope can realize release and retrieval of the underwater cleaning unit.