Cleaning device and cleaning robot system

The embodiment of the invention provides a cleaning device and a cleaning robot system. The cleaning device comprises a first cleaning part. A liquid storage tank is arranged on the first cleaning part and is used for storing liquid for cleaning a cleaned part; the liquid storage tank extends from the edge of the cleaned part to the center of the cleaned part; one end, corresponding to the edge of the cleaned part, of the liquid storage tank is a liquid injection end; and the other end, corresponding to the center of the cleaned part, of the liquid storage tank is a liquid outlet end. According to the scheme provided by the embodiment of the invention, the liquid is injected into the liquid storage tank from the liquid injection end, and the liquid flows from the edge of the cleaned part to the center of the self-cleaning part due to the extension direction of the liquid storage tank and flows out at the position corresponding to the center of the cleaned part; the infiltration speed of the cleaned part is in