The utility model relates to a production system of high -purity inulin, its characterized in that: the raw materials is handled and is got into the squeezer through wasing shaker, filament cutter, hot water leaching machine in proper order, and peace and quiet system is gone into to squeezer feed liquid pipe connector, gets into resin exchange system, the concentrated machine of membrane, evaporation concentrator A, chromatographic fractionation ware more in proper order, and high fructose thick liquid that the chromatographic fractionation ware was isolated gets into in proper order and obtains high fructose after resin burnishing machine A and the evaporation concentrator B processing and starch, the FOS thick liquid that the chromatographic fractionation ware was isolated gets into resin burnishing machine B, gets into evaporation concentrator C, super filter membrane sterilization ware more in proper order, obtains high -purity inulin after spray drier handles. Adopt the chromatographic fractionation ware to be divided into three kinds of components of monose, disaccharide and inulin with the inulin feed liquid, wherein the active principle content of inulin can reach more than 95%, and glucose, fructose and disaccharide (cane sugar) content greatly reduced when having improved product function nature, has also enlarged the product application scope.