A cleaning device comprises a travel mechanism (1) and a cleaning mechanism (2). The travel mechanism (1) comprises a base (11) and a travel portion (12) disposed on the base (11) and capable of driving the base (11) to move. The cleaning mechanism (2) is disposed on the base (11), and comprises a cleaning assembly (21) and a floating adjustment assembly (22) for tightly pressing the cleaning assembly (21) to the surface of a cleaned object. The cleaning assembly (21) comprises a roller brush (211). A first end of the roller brush (211) is disposed on the base (11), and a second end of the roller brush (211) is disposed on the base (11) by means of the floating adjustment assembly (22). The cleaning device ensures the cleaning effect by arranging the floating adjustment assembly.