The invention belongs to the field of microwave energy application devices, and provides a continuous transmission type quasi non-diffracted wave microwave reactor. The continuous transmission type quasi non-diffracted wave microwave reactor comprises a reaction device, a transmission device, a feeder device and a supporting device; the feeder device comprises a radiator, feed waveguides, a power distribution and phase shifting device, a coaxial transmission line and a microwave source; the microwave source is connected with the input end of the power distribution and phase shifting device through the coaxial transmission line, the output end of the power distribution and phase shifting device is connected with a plurality of the feed waveguides, the feed waveguides penetrate through a metal cavity to be connected with the radiator, the radiator is located right at the lower middle part of the back of the metal cavity, and rectangular radiation mouths which are docked with the feed waveguides and have the same sizes with the feed waveguides are formed in the radiator. The continuous transmission type quasi non-diffracted wave microwave reactor disclosed by the invention adopts a method of using multiple feed ports to feed to generate non-diffracted waves to irradiate reactants, so that the reaction efficiency is improved, the reaction speed is accelerated, the reaction uniformity is enhanced and the energy is saved, and in addition, the continuous transmission type quasi non-diffracted wave microwave reactor is combined with a continuous transmission type production line to be applied to the large-scale industrial production.