NOVELTY - A domestic sewage treatment water distribution device has a filter medium bottom supporting rod equipped with a water pipe, a water distributing main pipe with a ring water distributing main pipe. The ring water distributing main pipe is connected with a water distribution main pipe (4), which is connected with water distributing branch pipes. Each water distributing branch pipe is embedded with water outlet hole, a water distributing branch pipe orifice (6) and a hole. An end of the each water distributing branch pipe is embedded on a percolation medium surface through a connecting pipe.    USE - Domestic sewage treatment water distributing device.    ADVANTAGE - The device has high mass transfer efficiency and reoxygenation effect of filter medium, and avoids consuming electric energy, and is simple and economical to use.    DETAILED DESCRIPTION - A domestic sewage treatment water distribution device has a filter medium bottom supporting rod equipped with a water pipe, a water distribution main pipe with a ring water distributing main pipe. The ring water distributing main pipe is vertically connected with a water distribution main pipe, which is connected with water distributing branch pipes. Each water distributing branch pipe is embedded with a water outlet hole, a water distributing branch pipe orifice having diameter of 2 mm, and a hole having diameter of 1OO mm. An end of the each water distributing branch pipe is embedded on a percolation medium surface through a connecting pipe and embedded with a filter medium at depth of 50 cm of the water distributing main pipe. The device is filled water filter medium, and divided into three layers, which are filter medium lower layer (3), filter medium middle layer (2) and filter medium top layer (1). Particle diameter of lower layer is 32-16-8 mm, middle layer is 0.5-2 mm and lower layer is 1-1.2 mm.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a domestic sewage treatment water distributing device. '(Drawing includes non-English language text)'    Filter medium top layer (1)    Filter medium middle layer (2)    Filter medium top layer (3)    Water distributing main pipe (4)    Water distributing branch pipe orifice (6)