Provided is a granular food baking machine including an oven, a roller, a rotating shaft, a first motor, a bean feeding channel, a bean feeding hopper, a heating unit, and an exhaust system, the roller is arranged inside the oven, the rotating shaft penetrates through the front and rear ends of the roller, the first motor is connected with the rotating shaft in a driving manner, the upper end of the bean feeding channel is connected with the bean feeding hopper, the lower end of the bean feeding channel is communicated with the inside of the roller, a blanking valve is arranged in the bean feeding hopper, the heating unit is arranged in the oven and under the roller, the exhaust system includes a flue, a dust collecting barrel, a smoke suction pipe, and a smoke evacuation blower fan, one end of the flue is communicated with the bean feeding channel, the other end of the flue is communicated with the top of the dust collecting barrel, the upper and lower ends of the dust collecting barrel are enclosed ends, one end of the smoke suction pipe is connected with the smoke evacuation blower fan, and the other end of the smoke suction pipe penetrates through the top end of the dust collecting barrel and extends into the middle part of the dust collecting barrel. The coffee beans baked by the baking machine in the invention are greatly improved in quality, the baking fire control is simpler, the use is safe and reliable, and pollution free and energy saving are realized.