The invention relates to a hot-air system for a heating area of a barrel burley tobacco baking drying machine. The system comprises an exhaust fan, an exhaust pipe, an air outlet cover, an air outletdevice, a barrel, an air inlet device, an air inlet cover, a heat exchanger, a circulating fan, a fresh air supplementing pipe and a circulating air pipe, wherein the outlet end of the air outlet cover is connected with the inlet end of the exhaust pipe and the inlet end of the circulating air pipe; the air outlet device is arranged at the inlet end of the air outlet cover; the fresh air supplementing pipe communicates with the circulating air pipe; the outlet end of the circulating air pipe is connected with the air inlet of the air inlet cover through the heat exchanger; the air inlet deviceis arranged at the air outlet of the air inlet cover; the rotating barrel is arranged between the air inlet device and the air outlet device; and a controller of the exhaust fan, a controller of an air exhaust regulating valve, a controller of a fresh air adjusting valve, and a temperature and humidly detector are connected with a control system through electric signals. With the technical scheme, the problem that during the barrel baking drying process of the burley tobacco, material adhesion occurs, the dewatering is nonuniform, and automatic control on the hot air can not be realized is effectively solved, the hot air is effectively recycled, and thus the energy consumption is reduced.