NOVELTY - Urban domestic sewage treating system in desert, comprises a city sewage collecting system, a conveying system, a filter sieve dividing device, a biogas pool, a sand filtering purifying pool, a clean water preserving pool, a water purifying distributing device, an under drain water output water device, a domestic water purifying device and a circulating water channel. The city sewage collecting system, the conveying system, the filter sieve dividing device, the sand filtering purifying pool, clean water preserving pool and water purifying distributing device are connected by a pipeline.    USE - Used as an urban domestic sewage treating system in desert.    ADVANTAGE - The system provides water in deserts, makes the desert normal land group vital, helps in the survival of human beings and all organisms, prevents the two harmful sources of desertification and domestic sewage, and is environmental-friendly.    DETAILED DESCRIPTION - Urban domestic sewage treating system in desert, comprises a city sewage collecting system, a conveying system, a filter sieve dividing device, a biogas pool, a sand filtering purifying pool, a clean water preserving pool, a water purifying distributing device, an under drain water output water device, a domestic water purifying device and a circulating water channel. The city sewage collecting system, the conveying system, the filter sieve dividing device, the sand filtering purifying pool, clean water preserving pool and the water purifying distributing device are connected by a pipeline. The water purifying distributing device are respectively connected to two outlets of the under drain water output water device. The circulating water channel is connected to an inlet. The water purifying pool is connected to the domestic water purifying device. The sieve filter shunt device is set next to the biogas pool.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the urban domestic sewage treating system in desert.