Hydrogenation reactor is a stirring device for chemical reactions of gas-liquid, liquid-liquid, liquid-solid or gas-liquid-solid three-phase chemical materials. Hydrogenation reactor can fully stir various chemical materials under high pressure, temperature, high vacuum and other conditions to strengthen mass transfer and heat transfer process. Hydrogenation reactor is a kind of flammable, explosive, toxic and precious medium in high temperature, high pressure, high vacuum and other conditions. The hydrogenation reactor is the preferred equipment for stirring reaction under high vacuum and other conditions. It fundamentally solves the problem of shaft seal leakage which can not be overcome by packing seal and mechanical seal before. It has no leakage and pollution, long service life and maintenance-free. Carbon-manganese steel, stainless steel of various grades, titanium and titanium alloy, nickel, Hastelloy alloy, zirconium and its composite materials can be used in the autoclave body of hydrogenation reactor. The main material of hydrogenation reactor, the size, quantity, heating mode, inner structure, stirring speed and the form of impeller blade can be designed according to user's requirements; heating mode includes jacket steam, jacket heat conducting oil electric heating, jacket oil bath cycle, far infrared and other forms for users to choose and match when ordering. The surface of the autoclave body with polishing requirement can reach mirror polishing level. The material with high viscosity can be processed into conical bottom, which is convenient for discharging and cleaning. According to the manufacturing structure of hydrogenation reactor, it can be divided into three categories: open flat cover reactor, open elliptical head reactor and closed reactor. Each structure has its application scope, advantages and disadvantages.