NOVELTY - The system comprises an arc treatment pool (2) and material net cages (1). The arc treatment pool includes an inlet aerobic zone, an anaerobic zone and an outlet aerobic zone (3). The anaerobic zone is located at a bottom of the arc treatment pool. The inlet aerobic zone and the outlet aerobic zone are symmetrically arranged and communicated on both sides of the anaerobic zone. A top of the arc treatment pool and a gas guide tube (5) are disposed at a portion of the anaerobic zone. The anaerobic zone and the outlet aerobic zone are disposed at the bottom of the arc treatment pool.    USE - The system is useful for treating organic waste (claimed).    ADVANTAGE - The system allows economical treatment of the organic waste with improved biogas generation rate.    DETAILED DESCRIPTION - The system comprises an arc treatment pool (2) and material net cages (1). The arc treatment pool includes an inlet aerobic zone, an anaerobic zone and an outlet aerobic zone (3). The anaerobic zone is located at a bottom of the arc treatment pool. The inlet aerobic zone and the outlet aerobic zone are symmetrically arranged and communicated on both sides of the anaerobic zone. A top of the arc treatment pool and a gas guide tube (5) are disposed at a portion of the anaerobic zone. The anaerobic zone and the outlet aerobic zone are disposed at the bottom of the arc treatment pool. The material net cage is loaded with the organic wastes pass through the inlet aerobic zone. The gas guide tube is connected with a biogas outlet pipe through a check valve. The material net cages are uniformly distributed, and comprise stainless steel cage walls on which through holes with diameter of 1-2 cm. A space between every two adjacent through hole is 2-3 cm. The meshes knitted by the netting wires are arranged inside the stainless steel cage walls. A size of mesh openings is 8-10 meshes. The diameter of the netting wires is 0.3-0.5 mm. Wheels are arranged at the bottom of the material net cages. The material net cages are arranged inside the arc treatment pool and connected by metal chain rings. A traction mechanism (4) is arranged at the outlet aerobic zone, and is connected with the material net cages adjacent to the outlet aerobic zone. A H-shaped gas refluxing branch pipe arranged at the bottom of the metal chain ring is connected with a gas refluxing header pipe. The gas refluxing header pipe adopts a polypropylene random copolymer (PPR pipe) with a diameter of 6-12 cm. The H-shaped gas refluxing branch pipe adopts PPR pipe with a diameter of 4-8 cm. A round hole is arranged on the H-shaped gas refluxing branch pipe at a distance of 5-10 cm, and has a diameter of 2-3 cm. The anaerobic zone has a width of 1/3-3/4. An INDEPENDENT CLAIM is included for a method for treating organic waste.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a system for treating organic waste.    Material net cages (1)    Arc treatment pool (2)    Outlet aerobic zone (3)    Traction mechanism (4)    Gas guide tube. (5)