Decoupling reactor based on atmosphere switching

The invention relates to a reactor, and particularly relates to a decoupling reactor based on atmosphere switching. The decoupling reactor solves the problem that an existing high-temperature chemical reactor can not be well used for analyzing a multistage in-situ decoupling reaction of a solid carbon-based fuel. The decoupling reactor comprises a reaction pipe main body, a thermocouple side pipe and an instant feeding side pipe, wherein the reaction pipe main body sequentially comprises a lower pipe section, a lower annular space section, a lower porous plate, a reaction section, and an upper pipe section from bottom to top, the thermocouple side pipe and the instant feeding side pipe are arranged at two sides of the reaction section, one end of the thermocouple side pipe is connected with the outer side wall of the reaction section, and one end of the instant feeding side pipe is connected with the outer side wall of the reaction section. The decoupling reactor is used in the field of analysis and testing o