Desulfurization wastewater recycling method

The invention relates to the field of industrial wastewater treatment, and especially relates to a desulfurization wastewater recycling method. The method comprises the following steps: sequentially adding sodium hydroxide and sodium sulfate into desulfurization wastewater to remove magnesium ions and calcium ions; adding a flocculating agent and a coagulant aid into the desulfurization wastewatertreated in the previous step so as to remove colloidal substances and heavy metals; carrying out evaporative crystallization on the treated desulfurization wastewater to obtain secondary steam condensate, inorganic salts and a mother liquor; and repeatedly carrying out calcium and magnesium ion, colloidal substance and heavy metal removal and evaporative crystallization on the mother liquor untilthe mother liquor is zero-discharged. The respective purity of the inorganic salts prepared by the method can reach 90% or above, and the mother liquor is subjected to organic matter removal and repeated wastewater treatment