Flue gas desulfurization wastewater treatment and recycling system used in coal-fired power plant

The utility model discloses a flue gas desulfurization wastewater treatment and recycling system used in a coal-fired power plant. The system comprises a wastewater homogenizing pool (21), a four-linkage box (10), a precipitation tank (22), a defluorination tank (23), a flocculation tank (24), a clarifying and concentrating tank (30), a neutralizing tank (40), a sand filter (50), a final neutralizing tank (41), a water purification tank (60), a sludge tank (31), a slurry dewatering unit (32) and a tail water recycling system (601). After the desulfurization wastewater is treated, the sand in the desulfurization wastewater is filtered, and the tail water which meets requirements of the water quality of water supplied for the coal-fired power plant enters a circulating water system, so that water sources are saved, and no desulfurization wastewater is discharged.