The invention provides a treatment method of polymer flooding water of oil fields . The method comprises the following steps: (1) taking white mud which is waste slag from an alkali plant and 1.5mol/L muriatic acid or dilute sulphuric acid of the which the volume concentration is 15 percent; soaking the white mud in the muriatic acid or the dilute sulphuric acid according to a proportion and filtering to obtain filter liquor which is a required treating agent; (2) carrying out water quality testing on polymer blooding water; if the pH value of the flooding water is not between 9.5 and 12.5, regulating the pH value to be between 9.5 and 12.5 by a pH regulating agent; and adding the prepared treating agent to the polymer blooding water according to an adding quantity of 5,000mg/L-12,000mg/Lon the basis of the oil content and the content of suspended matters; (3) when the treating agent is added, stirring the polymer blooding water for 5-20 minutes at a stirring speed of 100 turns/minute-300 turns/minute, and then standing for sedimentation; and (4) filtering the polymer blooding water by quartz sand to carry out subsequent treatment. The invention has high treatment efficiency and reduces the operating expense of flooding water.