The double-layer stainless steel reaction kettle is designed with double-layer stainless steel. The inner layer can be stirred and reacted by putting the reaction solvent, and the interlayer can be connected to different cold and heat sources (refrigerated liquid, hot water or hot oil) for cyclic heating or cooling reaction. Under the set constant temperature, in a closed stainless steel reactor, the stirring reaction can be carried out under normal pressure or negative pressure according to the requirements of use, and the reaction solution can be refluxed and distilled. It is a modern fine chemical factory, biopharmaceutical and Ideal pilot and production equipment for the synthesis of new materials.