NOVELTY - Anaerobic solid-liquid mixed sewage treatment device comprises a reactor main body, a three-phase separator, a water distributor and a liquid level control system. The reactor main body is cylindrical and the top part of which is equipped with a top cover. An exhaust opening connected with a pressure regulating valve is provided at one side of the upper part in the reactor main body, while a water outlet is provided at the other side. A baffle plate and an overflow groove base plate of three-phase separator are fixed on inner wall of the reactor main body.    USE - Device for anaerobic treatment of solid-liquid mixed sewage in breeding field (claimed), particularly the waste matter and sewage of domestic animal.    ADVANTAGE - The device can stably work under high load of 15-22 kg chemical oxygen demand/m3/days, and has low investment, stable and simple operation and low processing cost.    DETAILED DESCRIPTION - Anaerobic solid-liquid mixed sewage treatment device comprises a reactor main body, a three-phase separator, a water distributor and a liquid level control system. The reactor main body is cylindrical and the top part of which is equipped with a top cover. An exhaust opening connected with a pressure regulating valve is provided at one side of the upper part in the reactor main body, while a water outlet is provided at the other side. The three-phase separator is provided at the upper part of the reactor main body. A baffle plate and an overflow groove base plate of three-phase separator are fixed on inner wall of the reactor main body. A slag outlet is provided in the center of the bottom of the reactor main body, on which a slag discharging valve for discharging slag and an electromagnetic valve for controlling residue are provided. The water distributor is provided at the lower part of the reactor main body in parallel. The inner side of the water inlet on the side wall is connected with one end of the water distributor. A water inlet valve and an electromagnetic valve for feeding water are provided at the outer side. The three-phase separator is mounted at the upper half part of the reactor main body, and comprises a baffle plate, a guiding cover, a baffle plate, a sludge settlement plate, an overflow weir, an overflow group base plate and the side wall of the upper half part of the reactor main body. The baffle plate and the overflow base plate are fixed on the inner wall of the reactor main body. The overflow weir is fixed on the overflow groove base plate. The lower part of the overflow weir is connected with the sludge settlement plate. The upper and lower sides of the baffle plate are respectively connected with the bottom of the sludge settlement plate and the upper part of the guiding cover, and the lower part of which is fixed on the baffle plate. The three-phase separator comprises a sludge returning zone and a sludge settling zone. The vertical height of the separator is 1/3-1/4 of the whole reactor main body. The water distributor is provided at the lower part of the reactor main body, which is composed of a water distributing main pipe and a water distributing opening that is fixed on the water distributing main pipe. One end of the water distributor is sealed while the other end is connected with the water inlet on the side wall of the reactor main body and is connected with the water inlet valve and the electromagnetic valve for feeding water. The liquid level control system comprises a controller which is respectively connected with the pressure regulating valve, a starting and stopping switch, a water inlet control electromagnetic valve, a residual control electromagnetic valve and a sludge interface meter, which are respectively arranged at the exterior of the reactor main body. A thermal insulating layer is provided at the exterior of the reactor main body. An INDEPENDENT CLAIM is included for a method for anaerobic treatment of solid-liquid mixing sewage in breeding field, comprising:    (A) feeding sewage in breeding field, and forming uniform and downwards impact water current on cross section of the device;    (B) decompressing organic material carried in water current into volatile fatty acid by acidified sewage layer, and further decomposing the organic material into methane and carbon dioxide by sewage layer of methanation;    (C) feeding the generated gas, together with floating sewage, into sewage reflux zone along with the water current, and completely removing organic material that is not completely removed;    (D) ascending and feeding gas-liquid-solid tri-phase current into gas separation zone, accelerating the flowing speed to form weak negative pressure, expanding the volume of gas, in this way, the gas quickly floats out of water surface, ascends to gas collection chamber, enters into pressure regulator, and then it is discharged out of the device and used;    (E) depositing the rest of the liquid in sewage deposition zone; discharging the methane liquid out of water outlet after passing through the weir; and returning the sewage into sewage reflux zone to form sewage internal circulation;    (F) generating a level difference between the water level of gas separating zone and water level of sludge settling zone, and when sludge interface sensor receives the information that concentration of sludge is too high, closing the water inlet control electromagnetic valve and opening the biogas residue control electromagnetic valve to descend the sludge interface;    (G) forming water flows uniformly downwards; making gas phase, liquid phase and solid phase in the device continuously lift into gas separating zone; and    (H) making the mixture of left liquid-solid phases enter the sludge settling zone to be settled, making the biogas liquid overflow through the overflow weir to be discharged by a water outlet, making the sludge backwards flow into the sludge backflow zone to form internal circulation.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view of a device for anaerobic treatment of solid-liquid mixed sewage in breeding field.