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 . <EOS>