The high-pressure reactor can fundamentally solve the problem of shaft seal leakage that was previously insurmountable by packing seals and mechanical seals. This device does not have any leakage or pollution. It is currently the most ideal device in China for chemical reactions under high temperature and high pressure, especially for chemical reactions with flammable, explosive and toxic media, which further demonstrates its superiority. The cauldron body and cauldron cover are made of specific stainless steel. The cauldron body is connected with flanges and threads, and the cauldron cover is a solid flat cover. The two parts are tightly connected by circumferentially distributed nuts and main bolts. of.