Blast burner

The utility model provides a blast burner which is good in effect of supplementing secondary air to inner ring burning flames. The blast burner comprises a burner body, the burner body is provided with an inner ring nozzle, an inner ring gas mixing cavity channel and a first air supply groove, the inner ring nozzle communicates with the inlet end of the inner ring gas mixing cavity channel, and the top of the first air supply groove is opened and communicates with the exterior of the burner body; the inner ring gas mixing cavity channel surrounds the outer part of the first air supply groove in the circumferential direction; the rectifying component is located below the inner ring gas mixing cavity channel, the rectifying component is provided with a rectifying cavity, an air inlet and a plurality of first air holes, the first air holes are formed in the top cavity wall of the rectifying cavity and communicate with the rectifying cavity and the first air supply groove, and the air inlet is formed in the botto