Abstract: A floor cleaning device which includes a handle of hollow pipe, one end of which is connected to a hose for supplying water, and a polishing head detachably connected to the other end thereof. The middle portion of the hollow pipe is divided into two flow passages by means of a partitioning. A valve is mounted in the upper end portions of the flow passages so as to selectively block either of them, and a net is stretched at the lower end of one of the flow passages. The polishing head has a brush or sponge for cleaning the floor and has plural holes communicating with the hollow pipe so as to supply the brush or sponge with water.