The utility model discloses a venturi tube type reactor. The device comprises a first straight cylinder section and a second straight cylinder section, a contraction section, a throat pipe section andan expansion section are sequentially connected between the first straight cylinder section and the second straight cylinder section. A first feeding pipe is arranged at the end, away from the contraction section, of the first straight cylinder section, at least one second feeding pipe is arranged on the pipe wall of the throat pipe section, a nozzle section is connected to the end, away from theexpansion section, of the second straight cylinder section, and a one-way valve is further installed between the second straight cylinder section and the nozzle section. According to the tubular reactor, the safety risk caused by reverse channeling in the material reaction process can be prevented, various materials are fully mixed and fully reacted, and the reaction efficiency of the tubular reactor is improved.