The DCIJL loop jet reaction device has excellent performance in both mass transfer and heat transfer, which greatly improves the reaction efficiency and reduces the reaction time. This device is mainly used for gas-liquid, liquid-liquid, gas-liquid-solid and/or other mass transfer reactions. Forming a loop jet system, the DCIJL loop jet reaction device is composed of a jet reactor, a high-performance circulating pump and an external heat exchanger. The principle of the ejector is the Venturi effect. A large amount of gas is entrained into the ejector by the high-speed liquid jet due to the self-priming effect and mixed and reacted with the liquid turbulently. The system forms two circulations. One is the liquid circulation delivered by an external circulation pump; the other is the gas circulation caused by the Venturi self-priming effect of the jet reactor. The device is suitable for following reactions: alkoxylation, alkylation, hydrogenation, nitration, amination, esterification, carbonylation, Fischer-Tropsch synthesis, etc.