The utility model discloses a curing barn heat exchanger which comprises a heat exchanger box, a soot settling chamber and a tail gas discharging pipe. A maintenance door is arranged on one side of the heat exchanger box, heat-release fins are connected on both the outer wall of the heat exchanger box and the outer wall of the maintenance door, a flue partition is connected on the inner wall of the heat exchanger box, the soot settling chamber is arranged on the lower portion of the heat exchanger box, heat-release fins are connected on the outer wall of the soot settling chamber, a fire incoming hole is arranged on one side of the soot settling chamber, an ash funnel is arranged at the bottom of the soot settling chamber, the tail gas discharging pipe is arranged at the top of the heat exchanger box, and the bottom of the soot settling chamber is connected on a heat exchanger supporting frame. Due to a plate-box-type structure, heat exchange area of the curing barn heat exchanger is increased; the heat-release fins are vertically welded with a heat exchanger body and can gasify a lot of tobacco tar when contacting with circulating airflow. A heat absorbing face is parallel to the airflow direction, so that less proneness to ash accumulation is realized, heat supply of the curing barn heat exchanger is ensured to be capable of being realized through fuel like biomass fuel which is light in ash weight and high in tobacco tar content after being burnt, the curing barn heat exchanger is high in raw material adaptability, and the ash funnel enables accumulated ash cleaning to be convenient and easy to implement.