Abstract: Desulfurization wastewater from coal-fired power plant has problems such as poor water quality,large water volume,and high treatment cost.The wastewater treatment technology is also constantly updated.The water quality and quantity of desulfurization wastewater of different power plants are also greatly different,and there are also big differences in the choice of treatment technology.In order to choose the desulfurization wastewater treatment technology more scientifically and effectively,the current desulfurization wastewater treatment technology of coal-fired power plants was summarized and analyzed,and the advantages and disadvantages of various treatment technologies were analyzed in detail according to the actual case.It provides a reference for coal-fired power plants to choose the zero-discharge technology of desulfurization wastewater. The research results show that the current zero-emission treatment technology for desulfurization wastewater of coal-fired power plants mainly includes: pretreatment technology for desulfurization wastewater,concentration and reduction technology,evaporative crystallization technology and transfer solidification technology,and the zero-emission treatment technologies of various wastewater are uneven.The triple tank method and double-alkali method in the pretreatment technology were analyzed in detail.According to the characteristics of the wastewater,the pretreatment link can be omitted,which can be omitted to reduce the investment cost.Concentration reduction technology includes membrane concentration( RO,FO,ED,etc.) and thermal concentration( using steam concentration,flue gas waste heat concentration).Membrane concentration can achieve a higher concentration ratio and system stability,but its higher investment and operating cost needs to be resolved.Thermal concentration has gradually become the mainstream concentration technology due to its low cost and high efficiency. The evaporative crystallization technology uses flue gas waste heat evaporation( bypass flue gasification,flue gasification),and the problems of corrosion and scaling in its operation need to be resolved.The cementing and fixing technology in the transfer and solidification technology not only can fix the high concentration of chloride ions in the desulfurization wastewater,but also have a good fixing effect on various heavy metal ions in the wastewater.The technology points out the place of the terminal high concentration brine produced by the treatment,and the solidified body can be reused.High concentration chloride ion can also be used to prepare water purifying agent to realize the secondary utilization of wastewater.At the same time,four principles for the selection of desulfurization wastewater treatment technology were proposed.The low-cost,low-risk and high-efficiency desulfurization wastewater zero-discharge process route is more in line with the current needs of enterprises.