The invention discloses a device for automatically removing materials from an air duct in a tobacco airflow drying tower. In the device, a rotating shaft parallel to a partition board is arranged above the air duct partition board in a tobacco shred drying tower; one end of the rotating shaft is rotationally connected to the outer wall of a drying air pipe in the drying tower and the other end ofthe rotating shaft extends out of the drying tower and is driven by a power mechanism; the rotating shaft is hermetically connected with the drying tower body; and the rotating shaft in the drying tower is fixedly connected with a cross rod parallel to the rotating shaft. By the device, accumulated tobacco shreds on the partition board in the drying tower can be automatically removed; caking and coking phenomena caused by influence of high-temperature airflow on the accumulated tobacco shreds are avoided; and quality stability of the tobacco shred products is improved.