Flue-cured tobacco heat supply furnace

The utility model discloses a flue-cured tobacco heat supply furnace which comprises a combustion furnace and two sets of heat exchangers which are located on the two sides of the combustion furnace respectively. The heat exchanger comprises a vertical heat exchange pipe and a smoke dust discharging box, the vertical heat exchange pipe is arranged in a snake shape, a plurality of ash discharging ports are formed in the bottom end of the vertical heat exchange pipe, an ash discharging pipe is detachably connected between the ash discharging ports and the smoke dust discharging box, a valve set is arranged on the ash discharging pipe, and an ash cleaning door is arranged on one side of the smoke dust discharging box; two sides of the upper end of the combustion furnace are provided with smoke outlets which are obliquely arranged downwards in the direction far away from the combustion furnace, the smoke outlets and the air inlet ends of the vertical heat exchange pipes are connected with smoke exhaust inclined p