A scrubber-dryer machine for cleaning flooring surfaces, comprising: a support frame; movement means associated to the frame, for permitting, during functioning, movement of the scrubber-dryer machine on a flooring surface, the movement means comprising, at a lower part of the scrubber-dryer machine, a plurality of wheels which enable, during functioning, advancing of the scrubber-dryer machine along a determined direction in a use direction; dispenser means of a liquid, said dispenser means being associated to the frame and enabling, during functioning, dispensing of said liquid at a flooring surface to be cleaned; the dispenser means comprising one or more liquid dispenser elements, at the lower part of the scrubber-dryer machine, such as to enable, during functioning, dispensing of said liquid at said flooring surface to be cleaned, at least a first tank for the liquid and at least a dispensing piping connected between said first tank and said one or more dispenser elements; recuperating means for the liquid, associated to the frame such as to enable, during functioning, aspiration at the flooring surface to be cleaned; the recuperating means comprising one or more aspirating mouths of the liquid, at the lower part of the scrubber-dryer machine, in order, during functioning, to enable aspiration at said flooring surface to be cleaned, at least a second tank for containing what is aspirated during use, and aspirating means operatively connected to said second tank and to said one or more aspirating mouths, said aspirating means comprising at least an aspirating device and at least an aspirating pipe; and wherein it further comprises: an ozone generating unit associated to the frame and comprising an ozone generator; and insertion means of ozone into the liquid operatively connected to the ozone generating unit and to the dispenser means of the liquid such as to insert, during functioning, ozone into the liquid at said dispenser means, characterised in that it comprises rotating brushes as cleaning means for scrubbing the flooring surface; wherein wheels, liquid dispenser elements, aspirating mouths and rotating brushes are all positioned at the lower part of the frame of the scrubber-dryer machine; and wherein, with reference to the use direction, the one or more dispenser elements are positioned downstream with respect to the one or more aspirating mouths. a support frame; movement means associated to the frame, for permitting, during functioning, movement of the scrubber-dryer machine on a flooring surface, the movement means comprising, at a lower part of the scrubber-dryer machine, a plurality of wheels which enable, during functioning, advancing of the scrubber-dryer machine along a determined direction in a use direction; dispenser means of a liquid, said dispenser means being associated to the frame and enabling, during functioning, dispensing of said liquid at a flooring surface to be cleaned; the dispenser means comprising one or more liquid dispenser elements, at the lower part of the scrubber-dryer machine, such as to enable, during functioning, dispensing of said liquid at said flooring surface to be cleaned, at least a first tank for the liquid and at least a dispensing piping connected between said first tank and said one or more dispenser elements; recuperating means for the liquid, associated to the frame such as to enable, during functioning, aspiration at the flooring surface to be cleaned; the recuperating means comprising one or more aspirating mouths of the liquid, at the lower part of the scrubber-dryer machine, in order, during functioning, to enable aspiration at said flooring surface to be cleaned, at least a second tank for containing what is aspirated during use, and aspirating means operatively connected to said second tank and to said one or more aspirating mouths, said aspirating means comprising at least an aspirating device and at least an aspirating pipe; and wherein it further comprises: an ozone generating unit associated to the frame and comprising an ozone generator; and insertion means of ozone into the liquid operatively connected to the ozone generating unit and to the dispenser means of the liquid such as to insert, during functioning, ozone into the liquid at said dispenser means, characterised in that it comprises rotating brushes as cleaning means for scrubbing the flooring surface; wherein wheels, liquid dispenser elements, aspirating mouths and rotating brushes are all positioned at the lower part of the frame of the scrubber-dryer machine; and wherein, with reference to the use direction, the one or more dispenser elements are positioned downstream with respect to the one or more aspirating mouths.