NOVELTY - Treatment of organophosphorus pesticide wastewater comprises adding 10-15% fungus Aspergillus niger culture medium solution into spherical activated carbon at a ratio of 1:2, mixing at 5-30 degrees C for 6-8 hours, stirring, filtering to obtain immobilized mycelium in sterile room, and storing in a refrigerator; and when chemical oxygen demand determined by potassium dichromate method (CODcr) value of the sewage is 200-10000, adding activated carbon comprising A. niger into wastewater, mixing the wastewater and mycelial pellets and standing for 3-6 days.    USE - Method for treating organophosphorus pesticide wastewater.    ADVANTAGE - The degradation rate can reach less than or equal to 98%.    DETAILED DESCRIPTION - Treatment of organophosphorus pesticide wastewater comprises: (A) adding 50 ppm methyl phosphorus in culture medium containing potato fungus A. niger, domesticating fungus Aspergillus niger for 3 days, and stopping domestication when 500 ppm phosphorus is reached; (B) taking 1000 mL potato basic culture medium at 121 degrees C, and then taking an annular A. niger into the sterile chamber, putting into table concentrator, stirring at 150-200 revolutions per minute (rpm) for 12-18 hours to obtain 40% fungus A. niger culture solution; (C) crushing common activated carbon to 100 meshes, adding activated carbon to 3 mass% of common adhesive, forming artificial ball with granularity diameter of 5-8 mm and drying; (D) adding 10-15% fungus A. niger culture medium solution into a spherical activated carbon in a reaction kettle at a ratio of 1:2, stirring and mixing at 5-30 degrees C for 6-8 hours in the reaction kettle, stirring at 150-200 rpm, filtering to obtain immobilized mycelium in sterile room, and storing in a refrigerator at 0-4 degrees C; and (E) when the CODcr value of the sewage is 200-10000, adding the obtained activated carbon comprising 1-2 mass% A. niger into wastewater, controlling the temperature at 5-30 degrees C, and mixing the wastewater and mycelial pellets in a shaker container at 150-200 rpm and standing for 3-6 days.