A cleaning system comprising a cleaning device and a base station, wherein: the cleaning device comprises: a roller for surface cleaning, the roller rotating in a first direction; a roller bracket wall, disposed above the roller; a dirty water tank, positioned at a rear side of the roller relative to a forward direction of the cleaning device; a clear water tank for providing clear water to the roller; and a scraper strip, positioned on one side of the dirty water tank, to squeeze the roller when the roller rotates, and guide squeezed water into the dirty water tank; and characterized in that the base station comprises: a dirty water collection device connected to the dirty water tank of the cleaning device through a water suction channel; a water suction device used to suck dirt in the dirty water tank into the dirty water collection device through the water suction channel; and a cleaning groove for accommodating the roller of the cleaning device when the cleaning device returns to the base station, wherein a width of a gap between the roller and the roller bracket wall is arranged to enable accumulated water in the cleaning groove to be lifted by rotation of the roller and form a water film in the gap, and the scraper strip is disposed downstream of the first direction with respect to the roller bracket wall. the cleaning device comprises: a roller for surface cleaning, the roller rotating in a first direction; a roller bracket wall, disposed above the roller; a dirty water tank, positioned at a rear side of the roller relative to a forward direction of the cleaning device; a clear water tank for providing clear water to the roller; and a scraper strip, positioned on one side of the dirty water tank, to squeeze the roller when the roller rotates, and guide squeezed water into the dirty water tank; and characterized in that a roller for surface cleaning, the roller rotating in a first direction; a roller bracket wall, disposed above the roller; a dirty water tank, positioned at a rear side of the roller relative to a forward direction of the cleaning device; a clear water tank for providing clear water to the roller; and a scraper strip, positioned on one side of the dirty water tank, to squeeze the roller when the roller rotates, and guide squeezed water into the dirty water tank; and characterized in that the base station comprises: a dirty water collection device connected to the dirty water tank of the cleaning device through a water suction channel; a water suction device used to suck dirt in the dirty water tank into the dirty water collection device through the water suction channel; and a cleaning groove for accommodating the roller of the cleaning device when the cleaning device returns to the base station, wherein a width of a gap between the roller and the roller bracket wall is arranged to enable accumulated water in the cleaning groove to be lifted by rotation of the roller and form a water film in the gap, and the scraper strip is disposed downstream of the first direction with respect to the roller bracket wall. a dirty water collection device connected to the dirty water tank of the cleaning device through a water suction channel; a water suction device used to suck dirt in the dirty water tank into the dirty water collection device through the water suction channel; and a cleaning groove for accommodating the roller of the cleaning device when the cleaning device returns to the base station, wherein a width of a gap between the roller and the roller bracket wall is arranged to enable accumulated water in the cleaning groove to be lifted by rotation of the roller and form a water film in the gap, and the scraper strip is disposed downstream of the first direction with respect to the roller bracket wall.