Method for treating desulfurization wastewater

The invention provides a method for treating desulfurization wastewater. The method for treating the desulfurization wastewater is characterized by comprising a dosing system, a salt separation system, an evaporative crystallization system and a dehydration system, and comprises the following operation steps: (1) sending the to-be-treated desulfurization wastewater into the dosing system, adding chemical agents, and conducting stirring for a reaction, so as to obtain a solution A; (2) sending the solution A into the salt separation system, and subjecting the solution A to softening and salt separation through a nanofiltration device to obtain a solution B; (3) sending the solution B into the evaporative crystallization system for evaporative crystallization; and (4) sending sediment whichis generated in the step (1) and the step (2) into the dehydration system for dehydration, and placing filter liquor, which is generated after dehydration is conducted, into a neutralizing box again for treatment. Therefore,