Wastewater processing method

The invention relates to a wastewater processing method. The method comprises the following steps: step one, individually collecting ion exchange regenerated liquid and reverse osmosis concentrated water, which are generated during the process of high efficient reverse osmosis processing technology; step two, subjecting the collected ion exchange regenerated liquid to a high efficient reverse osmosis pretreatment, then adding Na2S to precipitate divalent cations, dehydrating sludge, and subjecting supernate to pretreatment; step three, processing the collected reverse osmosis concentrated water by a nano filtration technology so as to separate inorganic salts in the concentrated water, wherein the product is composed of divalent salts mainly composed of divalent ions in the nano filtration concentrated water side and monovalent salts mainly composed of NaCl in the nano filtration producing water side; step four, in the nano filtration concentrated water side, carrying out an evaporation and crystallization treatment to form sulfate and concentrated liquor, and processing the concentrated liquor at regular intervals; step five, in the nano filtration producing water side, carrying out salt concentration by using an ionic membrane. The provided wastewater processing method has the advantages of high processing efficiency, low cost, energy saving, and environment-friendliness.