NOVELTY - A combined treatment device comprises first unit consisting of sewage feeding pipe (1), sewage lifting well (2), diving pump (3) and immobilized micro-organism quick bio-filtering tank, second unit consisting siphon feeding system and immobilized micro-organism pulse bio-filtering tank, and third unit consisting of immobilized micro-organism undercurrent land treatment and discharging pipe.    USE - A combined treatment device for dispersedly draining domestic sewage.    ADVANTAGE - The device has simple structure, low power consumption, stable running, automatic control, and low cost.    DETAILED DESCRIPTION - A combined treatment device comprises first unit consisting of sewage feeding pipe (1), sewage lifting well (2), diving pump (3) and immobilized micro-organism quick bio-filtering tank, second unit consisting siphon feeding system and immobilized micro-organism pulse bio-filtering tank, and third unit consisting of immobilized micro-organism undercurrent land treatment and discharging pipe. The sewage lifting well and sewage feeding pipe are connected. The desilting pit (21) is set at one side of the bottom of sewage lifting well. The diving pump has water discharging pipe I and water discharging pipe II which are connected in parallel. The immobilized microorganism quick bio-filtering tank comprises cylindrical tank (71), upper grate board and lower grate board in cylindrical tank. The vertical combined microorganism immobilized poriferous carrier is set between upper grate board and lower grate board. The spraying water distribution pipe I is set above upper grate board. The air inlet is set under lower grate board. The circulating returning pipe is set at one side of the bottom of cylindrical tank. The circulating returning pipe and sewage lifting well are connected. The siphon water feeding system comprises siphon water tank and siphon pipe. The siphon water tank is connected with one end of siphon pipe and water discharging pipe II. The composite filtering layer is set in immobilized microorganism pulse bio-filtering tank. The water discharging pipe III and immobilized microorganism undercurrent land treatment are connected. The discharging pipe is set at one side of immobilized microorganism undercurrent land treatment opposite to water discharging pipe III.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of combined treatment device.    Sewage feeding pipe (1)    Sewage lifting well (2)    Diving pump (3)    Desilting pit (21)    Cylindrical tank (71)