Floor scrubber self-cleaning device, cleaning system and cleaning method

The invention discloses a scrubber self-cleaning device, a cleaning system and a cleaning method. The self-cleaning device comprises a base, a cleaning disc and a rotating wheel; the base is providedwith an accommodation cavity with an opening; the cleaning disc is mounted on the base; the cleaning disc is provided with a plurality of protruding parts and further provided with a plurality of liquid leakage holes; the rotating wheel is installed on the cleaning disc, and the rotating wheel can rotate around a preset axis; the rotating wheel is provided with a plurality of blades which are annularly arranged relative to the axis, and the blades can rotate around the axis along with the rotating wheel; each blade is provided with a water scraping surface and a liquid guide surface which is opposite to the water scraping surface and is obliquely arranged, the water scraping surface is used for scraping up cleaning water/liquid when the rotating wheel rotates towards a first direction, andthe liquid guide surface