The invention discloses a single-bucket squeezing flat mop cleaning tool, which comprises a mop bucket and a flat mop, wherein the flat mop comprises a mop rod and a flat mop head which is movably connected to the mop rod; a wiping article is arranged on the flat mop head; a stroking port squeezing device is arranged on the mop bucket; during cleaning and water squeezing, the flat mop head is rotated to a state that the cleaning and water squeezing can be conducted; during cleaning, the flat mop head is moved up and down, and the flat mop head and the stroking port squeezing device mutually move and squeeze, so that the wiping article is squeezed and cleaned; and during water squeezing, the flat mop head is pulled upwards until getting separated from the stroking port squeezing device, andthe flat mop head and the stroking port squeezing device mutually move and squeeze, so that the wiping article is subjected to water squeezing. The cleaning tool provided by the invention, when used,is operated in a mode of holding the mop rod in two hands, so that it is more labor-saving and convenient to operate the cleaning tool, and water in the wiping article can be squeezed more thoroughlyduring water squeezing; and in addition, by providing the mop bucket which is matched with the flat mop, water squeezing and cleaning can be conveniently conducted in any time and at any place.