The utility model relates to a producing device of poly(ether-ketone-ketone), and belongs to the field of chemical industry production equipment. The producing device is characterized by comprising a polymerizing pot, a granulating machine and a granulating tank, wherein a discharging valve at the bottom of the polymerizing pot is connected with a material feeding port of the granulating machine through a pipeline, the bottom of the granulating tank is connected with a liquid phase inlet of the granulating machine through a pipeline, and an outlet of the granulating machine is connected with the upper end of the granulating tank through a pipeline. According to the connection installation of the granulating machine, the polymerizing pot and the granulating tank, the poly(ether-ketone-ketone) is enabled to be granulated under the action of washing of water inside the granulating tank, granulating and scouring are all conducted, aluminium ions are removed, the water inside the granulating tank is recycled, production cost is reduced, water resources are saved, and product competitiveness is improved.