A device for washing floors, comprising a handle that can be gripped by a user and is connected to a supporting element for at least one washing cloth that has at least one working portion arranged on a respective plane of arrangement, the device comprising a wringing device that is mounted so that it can slide on the handle and supports at least one friction tooth intended to act on the washing cloth, with the device placed in the wringing and cleaning condition, as a consequence of a relative sliding motion of the wringing device with respect to the handle.