Surface cleaning device

The invention relates to a surface cleaning device (10) comprising a suction assembly (22) for forming a suction flow, and comprising a suction nozzle (14) fluidically connected to the suction assembly (22) for suctioning a liquid-air mixture, and comprising a separation device (44) for separating liquid out of the suctioned liquid-air mixture, and comprising a liquid tank (42) for receiving the separated liquid, wherein the separation device (44) has an inlet channel (60) for the suctioned liquid-air mixture, at least one flow deflection element (70) for deflecting the liquid-air mixture, andan air outlet channel (62) for providing the suctioned air to the suction assembly (22). In order to guarantee a separation of liquid that is as location-independent as possible, the separation device (44) has a separation unit (52) with an inner tube (54) and an outer tube (56) surrounding the inner tube (54) in the peripheral direction with the formation of an annular space (82), wherein the inlet channel (60) and the