Method for recycling desulfurization wastewater

The invention discloses a desulfurization wastewater recycling method which comprises the following steps: discharging desulfurization wastewater into a buffer pool, reducing the COD (Chemical Oxygen Demand) value in the wastewater by stirring and aerating, precipitating suspended matters in the water, and filtering to obtain filtrate A and filter residue A; the filtrate A is added into a reaction tank, a calcium reagent and an aluminum reagent are added into the reaction tank, and the molar ratio of chloride ion content in the calcium reagent, the aluminum reagent and the filtrate A is 5: 2.5: 1; carrying out solid-liquid separation on the solid-liquid mixture, and filtering to obtain filtrate B and filter residue B; the filtrate B flows into a clarification tank, PAM is added for a flocculation precipitation reaction, and filtrate C and filter residues C are obtained through filtering; feeding the filtrate C into a low-temperature vacuum evaporation system to obtain regenerated water A; discharging the recl