The invention belongs to the field of microwave energy utilizing devices, and provides a continuous transmission type focusing microwave reactor. The continuous transmission type focusing microwave reactor comprises a reaction device, a transmission device, a feed device and a supporting device, and is characterized in that the feed device comprises a metal reflecting surface, a radiating trumpet, a coaxial transmission line, a waveguide coaxial converter and a microwave source, wherein the metal reflecting surface is arranged on the inner wall of the top surface of a metal cavity; the microwave source is connected with the radiating trumpet through the coaxial transmission line and the waveguide coaxial converter; the radiating trumpet is fixed to the side wall of the metal cavity, runs through the metal cavity, and irradiates at a certain inclination angle relative to the wall of the metal cavity, so that the focus of the metal reflecting surface is positioned in the direction of a main lobe of the radiating trumpet. In a way of irradiating a detected object at a maximum field strength point by feeding the side end of a waveguide into the metal wall, reflecting and focusing, the continuous transmission type focusing microwave reactor improves the reaction efficiency, speeds up the reaction, improves the reaction uniformity and saves the energy; the continuous transmission type focusing microwave reactor is combined with a continuous transmission type production line, and is applied to large-scale industrial production.