NOVELTY - Combined treatment of poultry excrement, straw and sewage, comprises anaerobic fermentation and biological contact oxidation treatment, where the process specifically comprises (i) mixing the crushed straw, excrement and sewage, and carrying out anaerobic fermentation treatment, (ii) removing the suspension substance of the biogas slurry, homogenizing water quality, removing oil, reducing chemical oxygen demand (COD) and ammonia-nitrogen through biological contact oxidation treatment, precipitating, and draining water, and (iii) preparing the biogas residue into organic fertilizer.    USE - The method is useful for combined treatment of poultry excrement, straw and sewage.    ADVANTAGE - The method can process animal manure, straw, and rural domestic sewage; and can produce biogas and achieve resource utilization of the waste, which has the characteristics of simple and intensive process, high resource utilization rate and good operation effects.    DETAILED DESCRIPTION - Combined treatment of poultry excrement, straw and sewage, comprises anaerobic fermentation and biological contact oxidation treatment, where the process specifically comprises (i) mixing the crushed straw, excrement and sewage, then carrying out anaerobic fermentation treatment, (ii) removing the suspension substance of the biogas slurry produced by the anaerobic fermentation treatment, then homogenizing water quality, removing oil, reducing chemical oxygen demand (COD) and ammonia-nitrogen through biological contact oxidation treatment, precipitating, and draining water for agricultural irrigation, and (iii) taking the biogas slurry produced by the anaerobic fermentation treatment as energy after dehydrating and desulfurization, and then preparing the biogas residue into organic fertilizer after fertilizer composting. An INDEPENDENT CLAIM is also included for a device for carrying out combined treatment of poultry excrement, comprising an anaerobic fermentation tank, where the biogas liquid outlet is connected to a biological contact oxidation pool through a grating and an adjusting pool, which are connected in series. The biological contact oxidation pool is connected with an inclined plate precipitating pool. The biogas outlet of the anaerobic fermentation tank is connected to a gas storage device via a dehydrating device, a desulfurization device, a buffer tank and an air compressor, which are connected in series.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for carrying out combined treatment of poultry excrement (Drawing includes non-English language text).