Abstract: With the diversification of oilfield exploitation methods, the water quality of produced water has undergone major changes. Among them, the produced water containing dissolved gas and produced water containing polymers all appeared flocs floating during the reaction and sedimentation treatment process, resulting in the accumulation of scum on the top of the tank and unable to be discharged out of the tank, as well as serious problems that the quality of the effluent water contained oil and suspended solids. In order to meet the stability standards of oilfield produced water, the structure of produced water containing dissolved gas was optimized and improved on the basis of the conventional produced water reaction and settlement treatment device. The bidirectional separation cyclone reaction and settlement water treatment device developed has the bidirectional separation function of automatic slag collection in the upper part and automatic mud discharge in the lower part to achieve water purification treatment. The device adopts skid-mounted and automated design. The field application results show that the effluent quality of the device after treatment is stable and up to standard, the treatment process is less. The development of the device effectively reduces the operating cost and has significant social and environmental benefits.