Floor-cleaning machine having a base a cleaning-element arrangement which is driven and held on a bottom side of the base and serves for engagement with a floor surface, wherein the cleaning-element arrangement has at least one driven cleaning element (51, 61) to which there are attached engagement elements for engagement with a floor surface to be cleaned, wherein sections, intended for engagement with the floor surface, of the engagement elements extend in an engagement-element plane, an operating bar which is attached to the base and serves for guiding and actuating the floor-cleaning machine, a suction foot which is attached to the base or to the operating bar and serves for sucking cleaning liquid up from the floor surface, a dirty-water tank which is attached to the base or to the operating bar and serves for receiving cleaning liquid taken up by the suction foot, a suction turbine which is attached to the base and has a suction-turbine housing, the latter having an inlet opening and an outlet opening, wherein the suction turbine is configured to generate a suction-air stream from the suction foot into the dirty-water tank during operation, wherein the suction turbine is constructed in such a way that the suction-air stream passes through the inlet opening to the outlet opening, wherein provision is made of a separating container which adjoins the suction-turbine housing and whose interior space is connected to the inlet opening and which has an inlet, connected to the interior space, and has a bottom-wall section, facing towards the interior space, wherein the bottom-wall section, as seen along a vertical axis extending perpendicularly to the engagement-element plane, is arranged closer to the engagement-element plane than the inlet opening, and wherein leading from the bottom-wall section into the surroundings is a drainage opening which is provided with a valve which is configured so as to be closed when the suction turbine is in operation and to be open when the suction turbine is not in operation. a base a cleaning-element arrangement which is driven and held on a bottom side of the base and serves for engagement with a floor surface, wherein the cleaning-element arrangement has at least one driven cleaning element (51, 61) to which there are attached engagement elements for engagement with a floor surface to be cleaned, wherein sections, intended for engagement with the floor surface, of the engagement elements extend in an engagement-element plane, an operating bar which is attached to the base and serves for guiding and actuating the floor-cleaning machine, a suction foot which is attached to the base or to the operating bar and serves for sucking cleaning liquid up from the floor surface, a dirty-water tank which is attached to the base or to the operating bar and serves for receiving cleaning liquid taken up by the suction foot, a suction turbine which is attached to the base and has a suction-turbine housing, the latter having an inlet opening and an outlet opening, wherein the suction turbine is configured to generate a suction-air stream from the suction foot into the dirty-water tank during operation, wherein the suction turbine is constructed in such a way that the suction-air stream passes through the inlet opening to the outlet opening, wherein provision is made of a separating container which adjoins the suction-turbine housing and whose interior space is connected to the inlet opening and which has an inlet, connected to the interior space, and has a bottom-wall section, facing towards the interior space, wherein the bottom-wall section, as seen along a vertical axis extending perpendicularly to the engagement-element plane, is arranged closer to the engagement-element plane than the inlet opening, and wherein leading from the bottom-wall section into the surroundings is a drainage opening which is provided with a valve which is configured so as to be closed when the suction turbine is in operation and to be open when the suction turbine is not in operation.