Jacket hot flue gas distribution device of external heated rotary furnace

The utility model provides a jacket hot flue gas distribution device of an external heated rotary furnace. A rotary furnace outer jacket is divided into a three-section structure which comprises an inlet jacket, a straight-section jacket and an outlet jacket, a flue gas divider shaped like a Chinese character 'ren' is arranged in the center of a hot flue gas inlet in the inlet jacket, the lower portion of the flue gas divider is closed, and due to the action of the divider, hot flue gas flows towards two sides in the circumferential direction after entering the jacket. A circle of annular plate is arranged in the inlet jacket and on the outer side of a rotary furnace barrel, and a plurality of circular holes are evenly formed in the annular plate in the circumferential direction. Due to the arrangement of the flue gas divider and the circular plate with the holes evenly formed in the circumferential direction, the hot flue gas enters the inlet jacket, disperses in the circumferential direction, then axially m