Refining method of salt-containing wastewater

The invention provides a method for refining salt-containing wastewater, which comprises the following steps: a) removing impurities from the salt-containing wastewater, and controlling the pH value to be 2-4 by replenishing hydrochloric acid to obtain electrodialysis raw water; b) performing electrodialysis on the electrodialysis raw water obtained in the step a), and controlling the end-point conductivity to be 75-90mS/cm to respectively obtain strong brine and light brine; wherein the strong brine is deeply refined and then is used for chlor-alkali recycling; and after the light salt brine flows back to the zero-discharge pretreatment system, repeating the step a) for refining. Compared with the prior art, the refining method provided by the invention has the advantages that specific process steps, conditions and parameters are adopted, overall better interaction is realized, the salt is concentrated, migration of TOC along with the salt is limited, biased concentration of the salt is enhanced, accumulatio