The invention discloses a ship planking cleaning device. The device includes at least two rollers, mounting bases used for fixing the rollers, a power source used for driving the rollers to rotate and transmission shafts used for transmitting the power of the power source to the rollers, wherein each roller can rotate around the axis of itself on the corresponding mounting base, the side, away from the corresponding mounting base, of each roller is provided with a Mecanum wheel made of magnetic materials, and the hubs of the Mecanum wheels can rotate along with the rollers; first brushes for cleaning a surface to be cleaned are arranged on the rollers and can rotate along with the corresponding rollers; by arranging the first brushes capable of rotating along with the rollers on the rollers, the surface to be cleaned can be cleaned; by arranging the Mecanum wheels made of the magnetic materials on the rollers, rotation directions of all the rollers can be controlled, and therefore the movement direction of the ship planking cleaning device body can be controlled, and meanwhile, the ship planking cleaning device body can be attracted to the surface to be cleaned.