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This application relates to a treatment device for ferric phosphate wastewater evaporation mother liquor, with a height-to-inner-diameter ratio ≥2.5, comprising: a shell; the shell including a cylindrical section and a conical bottom; a cap at the top of the cylindrical section; a stirring mechanism on the cap; an overflow port on the upper side wall of the cylindrical section; an overflow ring corresponding to the overflow port inside the cylindrical section; one end of a feed pipe communicating with the cap; the conical bottom communicating with the cylindrical section; a discharge port on the side wall of the conical bottom; and a volume ≥0.5 m³. 3 A heat exchange mechanism is fitted onto the outer surface of the cylindrical section and the conical bottom; the heat exchange mechanism is located between the overflow port and the discharge port; the height difference between the overflow port and the discharge port is ≥800mm. This device improves crystallization efficiency and crystallization effect by optimizing the shell structure.