Using polyacrylic acid，sodium polyacrylate，polyacrylamide（non-ionic），aluminum potassium sulphate，DAMPE （modified demulsifier）as the main raw materials，a compound quenching agent was prepared by compounding，and was applied to oily sludge treatment by tempering and centrifugation. The solid-liquid ratio，stirring time，centrifugal time，and centrifugal speed was investigated to determine the optimal centrifugation conditions. Through the single flocculation and orthogonal experiments，the amount of each flocculant was determined to obtain the best compound flocculant. The compound quenching agent was obtained by combining the best compound flocculant with DAMPE，and the best tempering temperature was determined by investigating the deoiling effect. The results showed that the best treatment conditions for oily sludge were as follows：solid liquid ratio was 1∶2，stirring time was 20 min，centrifugal time was 30 min，centrifugal speed was 3600 r/min. The demulsifier DAMPE and the complex flocculant（5 mg/L polyacrylamide + 2.5 mg/L polyacrylic acid + 5 mg/L sodium polyacrylate + 5 mg/L alum）were mixed at a mass ratio of 2∶3 to obtain a compound quenching agent. Under optimal treatment conditions，when the tempering temperature was 45℃，the deoiling effect was the best and the deoiling rate was up to 95.66%. The composite tempering-centrifugation treatment could realize the three-phase separation of oil cement and was an effective treatment technology for oily sludge