The mop cleaner is provided. Mop cleaner provided, equipped with a handle bags; Is fastened to the lower end of the bag, the old binding screw having an axis on the inner side is connected, is connected to the upper holder is connected, the connection dehydration knob that is rotatably connected to an outer surface of the connection tube holder; Connected slidably moves along the connecting tube, the one-way clutch bearing that rotates only in one direction on the inner side is connected, the connector is connected to the inner ring of the clutch bearing, shaft engaging the screw shaft inside the connector a spiral groove is designed to be adjustable rods; Above is entered into the variable-rod lower end, but to dehydrate the rotating plate and the moisture absorbed in the brush, the brush having a lower portion including a dewatering tank provided with a receiving space therein, opening and closing the receiving space in the upper portion of the dewatering tank the cover is provided for, and is installed the rotating shaft to the bottom of the receiving space, wherein be a dehydration tube shaft coupled to the upper portion of the rotary shaft, obtain the dehydrated forming a jam by said dewatering tank top and the coupling piece support in the adjacent lower portion of the barrel to by being provided with a, and more convenient to perform a dehydration operation of the brush-stained foreign objects through the cleaning of only the vertical movement of the connection tube.