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The core part of magnetic stirring is a ring-shaped strong magnetic coupling stirring device. A plurality of magnetic steel rings are made of two powerful permanent magnets inside and outside; the inner magnetic steel body is sealed in a stainless steel sealed cylinder to connect the stirring part, and the sealed cylinder and The kettle cover, kettle body, and fastening connection form a static sealed cavity, so that the reaction medium is completely sealed in a statically sealed state, without any leakage, pollution or personal danger; the speed-regulating motor drives the outer magnetic steel body, and the strong magnetic force passes through the stainless steel without contact The made sealed cylinder attracts each other with the strong magnetic force of the inner magnetic steel body enclosed in the sealed cylinder, and is mutually positioned to act on the axial rotation traction to perform high temperature and high pressure stirring reaction.