NOVELTY - Processing coking wastewater involves inoculating microorganism strain into aerobic decarbonizing tank, anaerobic denitrification tank and aerobic nitrifying tank, where the dissolving oxygen of the aerobic decarbonizing tank, the anaerobic denitrification tank and the aerobic nitrifying tank are 2-3 mg/L, 0-0.5 mg/L and 2-4 mg/L, respectively; and adding sodium hydrogen phosphate (0.003-0.005 mass%) everyday.    USE - Method for processing coking wastewater (claimed).    ADVANTAGE - The method makes COD and NH3-N in the wastewater meet the first-grade requirements of integrated wastewater discharge standard. The denitrification rate of the system is high and the concentration of the nitrate nitrogen in the output water is low.    DETAILED DESCRIPTION - Processing coking wastewater comprises:    (A) transferring 0-60% pretreated coking wastewater into an aerobic decarbonizing tank to be decarbonized through a valve A; standing for 6-12 hours; decarbonizing and transferring the water into an anaerobic denitrification tank; transferring 40-100% pretreated coking wastewater into the anaerobic denitrification tank through a valve B; standing for 15-25 hours;    (B) transferring the waste into an aerobic nitrifying tank; adding alkaline liquid to the aerobic nitrifying tank; standing for 20-30 hours; transferring the water into a secondary sedimentation tank to be precipitated for 2-3 hours;    (C) refluxing clarified water into the anaerobic denitrification tank to carry out denitrification, where the refluxing ratio is 300-500%; refluxing sludge into the aerobic decarbonizing tank and the anaerobic denitrification tank, where the sludge refluxing ratio is 50-100%; coagulating the output water of the secondary sedimentation tank and discharging the water when the water achieves at the requirements; and    (D) when the method processes the coking wastewater, inoculating microorganism strain into the aerobic decarbonizing tank, the anaerobic denitrification tank and the aerobic nitrifying tank, where the dissolving oxygen of the aerobic decarbonizing tank, the anaerobic denitrification tank and the aerobic nitrifying tank are 2-3 mg/L, 0-0.5 mg/L and 2-4 mg/L, respectively, and the pH are 6.5-7.8, 6.5-8.2 and 6.8-8.5, respectively, and the temperature is 20-35 degrees C; and adding sodium hydrogen phosphate (0.003-0.005 mass%) everyday.