The invention discloses a recycling technology for organophosphorus pesticide wastewater and relates to the technical field of wastewater treatment. The technology mainly comprises the following steps: firstly, intensively conveying untreated organophosphorus pesticide wastewater into a water collection tank and then pumping the untreated organophosphorus pesticide wastewater into a sedimentationtank and carrying out precipitation; adding a coagulant I into waste liquid which is not precipitated; conveying the mixture into an ultrasonic air-floating No. I tank; after carrying out air floating, adding a coagulant II and conveying into an ultrasonic air-floating No. II tank; after carrying out the air floating, discharging wastewater; pumping the wastewater into a regulation tank and mixingand blending with domestic sewage; after pumping into a biological contact oxidization tank and carrying out biochemical treatment, pumping into a secondary sedimentation tank and precipitating to remove sludge impurities with relatively large particles; and filtering and recycling waste liquid subjected to secondary sedimentation through a multi-grade membrane separation device. By adopting therecycling technology provided by the invention, the content of phosphorus in the organophosphorus pesticide wastewater is effectively removed, and the removal rate of COD (Chemical Oxygen Demand) andBOD5 (Biochemical Oxygen Demand 5) is improved, so that up-to-standard emission of the sewage is realized and pollution of the sewage to the environment is reduced; and the sewage is recycled and reutilized, so that water resources are saved and the environment is also protected.