In　order　to　ensure　the　FGD　(Flue　Gas　Desulfurization)　system　security　and　reliability,　part　of　the　wastewater　should　be　discharge　from　the　FGD　system.　Desulfurization　wastewater　with　high　salinity,　high　corrosion　and　other　characteristics　will　lead　to　water　pollution　and　waste　of　resources,　and　it　is　necessary　to　take　a　security　and　stability　method　to　treat　high　concentration　saline　wastewater.　The　zero　discharge　treatment　technology　of　desulfurization　wastewater　was　proposed,　and　a　coal-fired　power　plant　desulfurization　wastewater　as　the　research　object,　designed　the　system　process,　carried　out　experimental　study　of　pretreatment　combined　with　evaporation　crystallization　of　wastewater.　In　the　pretreatment　stage,　sodium　sulfate　was　addded　to　the　water,　and　then　the　effluent　was　pumped　into　the　evaporation　crystallization　unit,　based　on　the　method　of　gypsum　crystal,　the　high　purity　sodium　chloride　was　prepared.　Pilot　experimental　results　show　that　the　system　treatment　technology　for　power　plant　desulfurization　wastewater　zero　discharge　is　feasible,　which　can　realize　the　crystallization　salt　resource;　Sodium　chloride　salt　crystals　after　purification　for　more　than　99.10%　purity,　satisfy　the　standard　of　industrial　salt　optimal　level,　and　can　be　utilized　as　industrial　raw　material.