The invention discloses a high-purity konjac capsule processing technology and device. Konjac capsules can be prepared by the technology that includes drying, crushing, degreasing, alkali extraction,heating, stirring, acid neutralization, H2S condensation, anhydrous ethanol cleaning, centrifuging, white precipitate obtaining, 60% of ethanol soaking, ultrasound assisting, washing, swelling 1%, dehydration, 95% of ethanol washing, anhydrous ethanol washing, drying, the adding of L-Carnitine-L-Tartrate, superfine grinding, blending, filling and split charging. High purity and activity konjac glucomannan can be prepared through the technology, the degree of purity can up to more than 95%, and preservation rate of antioxidant activity can reach more than 98%. Through the adoption of a plant capsule filling method, palatability can be greatly improved, absorption rate in vivo can be enhanced, and anti-obesity effects can be increased. The operation of the device are visualized in a whole course; automatic manufacturing can be realized through a micro ultrasonic cleaner, rotating motors, rectangular box, telescopic rod, a duct, a decompression chamber, a freeze dryer, etc.; and the technology and device are simple in structure and strong in practicality.