The in-situ infrared transmission cell reaction system is mainly used to study the infrared spectral characteristics of samples under different temperatures and gas environments. The product mainly consists of three parts: a reaction tank, a mixing control system, and a temperature control system. The main body of the reaction tank is made of 316L stainless steel material and equipped with infrared windows. The mixing control system accurately controls the flow rate of each gas path and achieves mixing through a mass flow meter. The temperature control system controls the temperature of the gas path, mixing tank, and reaction tank through various sensors.