NOVELTY - The process comprises making the landfill leachate in a primary settling tank to settle, then entering an adjusting pond to adjust the water quality and water amount for 5-10 days, pumping the landfill leachate to a water distribution pond by a pump from an adjusting pond, then entering an upstream type anaerobic sludge bed reactor via the distributed water in the water distribution pond, separating the generated methane, sewage and sludge via a three-phase separator at an upper part of the anaerobic reactor and making the methane enter gas collecting room.    USE - The process is useful for treating landfill leachate.    ADVANTAGE - The process is simple, eco-friendly, effectively removes the chemical oxygen demand, total nitrogen, total phosphorus and heavy metal ion in the high concentration organic wastewater.    DETAILED DESCRIPTION - The process comprises making the landfill leachate in a primary settling tank to settle, then entering an adjusting pond to adjust the water quality and water amount for 5-10 days, pumping the landfill leachate to a water distribution pond by a pump from an adjusting pond, then entering an upstream type anaerobic sludge bed reactor via the distributed water in the water distribution pond to perform the anaerobic treatment, separating the generated methane, sewage and sludge via a three-phase separator at the upper part of the anaerobic reactor, making the methane enter a gas collecting room, the sludge settle in the sludge bed of the anaerobic reactor and sewage discharge from the upper part of the reactor, delivering the sewage after performing the anaerobic treatment to an aerobic reactor to treat, settling and separating the sewage after performing the aerobic treatment, discharging the liquid supernatant by the settling pond, refluxing the sludge part of the sediment to the aerobic reaction pond to continue performing the aerobic treatment, discharging the other part of sludge to the sludge concentrating pond, making the liquid supernatant after performing the aerobic treatment and settling enter an aquatic plant pond to treat, then discharging after disinfecting and delivering the sludge after performing the anaerobic treatment and the aerobic treatment to a sludge concentrating pond, settling and concentrating, obtaining the concentrated liquid supernatant, refluxing to the adjusting pond to circularly treat after processing, dewatering the concentrated sludge and then conveying to the landfill to treat. Chemical oxygen demand in the water distribution pond is 1000-2000 mg/l having a pH value of 6-8. A concentration of the sludge entering the anaerobic reactor is 2000-3000 mg/l. A reaction temperature is 20-30 degrees C. The aerobic reaction pond is an oxidizing ditch or a reaction pond or oxidizing ditch with the aeration function. An aerobic reaction time is 24 hours. A sludge concentration in the oxidizing reaction pond is 1200-1500 mg/l and an oxygen dissolving amount in the reaction pond is 5-7 mg/l. The active sludge is added in the aerobic reaction pond. The aquatic plant pond is formed by more than one small pond; the sewage in the pond is directly flowed through the strong dirt-resisting plant, medium dirt-resisting plant or weak dirt resisting plant. The disinfecting treatment is ozone disinfection. The concentrated liquid supernatant discharged from the sludge concentrating pond is treated by the coagulating sedimentation method after oxidizing and reducing and then refluxing to the adjusting pond.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a process for treating landfill leachate (Drawing includes non-English language text).