Waste water deep treatment method for thickened oil extracted in oil field

The invention relates to the field of petroleum collection and particularly relates to a deep treatment method for thickened oil waste water. The waste water deep treatment method comprises the following steps: isolating oil; performing air floatation; performing anaerobic decomposition to put air floatation clarified liquor into an anaerobic pool, keeping at 15-45 DEG C, standing for a certain period of time and then obtaining undegraded waste water; performing oxidative degradation, arranging biological activated carbon in an ozone reaction vessel, introducing ozone into the ozone reaction vessel, and standing for a certain period of time to obtain degraded waste water; and then treating with a quick infiltration device, and thus obtaining purified water to be discharged. According to the waste water deep treatment method for thickened oil extracted in an oil field, after treating various impurities in the waste water in sequence, ozone and biological activated carbon are utilized toperform oxidized reduction treatment on an original hard-to-degrade organic compound, so as to be beneficial for further degradation operation; and an intermediate water tank is arranged according tothe processing property of ozone so as to control the treatment process, thus ensuring the ozone biological activated carbon treatment efficiency, reducing organic pollutant COD to be below 50mg/l, and providing effective guarantee for reaching the standard stably.