Konjac glucomannan, also known as KGM, is a kind of natural polymer soluble dietary fiber, which is the best of all dietary fibers. It contains no calories, feels full, and can reduce and delay the absorption of glucose, inhibit the synthesis of fatty acids, and has excellent fat-reducing and slimming effects. Konjac glucomannan not only reduces fat, but also helps to relieve constipation, stabilize blood sugar, reduce blood fat and resist fatty liver, which is safe and has no toxic and side effects. Because glucomannan has high viscosity, high water absorption and rapid expansion, the processing technology of konjac is limited. The purity of konjac glucomannan in the existing konjac food is generally low, and people consume little glucomannan.