TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Device: In the device for gasifying and baking tobacco leaf by directly burning biomass energy, the burner is divided into two fuel cabins by an upright separation board, the fuel cabin door is set at the upper part of each fuel cabin and the fire bar is built at the lower part; the shafts of the fire bars pass through two sides of the burner to be connected, the shaft of one fire bar has a crank, two mutually parallel fire bars are connected by a link mechanism; the ash hopper is set at the lower part of the fire bar, a drawer-type ash collecting hopper is set in the ash cabin, a primary distributed wind regulation opening connected to the fuel cabin is set in the middle of the burner at the upper part of the ash hopper. The front end of the burner has an interlayer equipped with an air inlet board, the air inlet board capable of regulating the amount of the inlet wind is mounted in the primary wind inlet, a row of secondary wind inlets connected to the fuel cabin is arranged at the lower part of the wind inlet board, the primary wind inlet is connected to the fuel cabin by two wind inlets at the internal end. Moreover, a rectangular opening connected to the combustion room and fuel cabin is built at the lower part of the middle of the burner. There are six looking-fire regulation openings at the top of the combustion room, two secondary distributed wind regulation openings are set at two lateral faces, two ash cleaning doors are arranged at the lower part of the distributed wind regulation opening, the rear end of the combustion room is a rectangular scoop structure and the end has an air outlet pipe connected to the heat exchanger. The air outlet pipe of the burner is connected to the main pipe of the heat exchanger by a flange, the heat exchanger comprises a main air inlet pipe, a main air outlet pipe and three main middle pipes arranged between them, the main air inlet pipe is connected to the first main middle pipe by six branched pipes, the first main middle pipe is connected to the next main middle pipe by six branched pipes; the second main pipe is connected to the third main middle pipe by six branched pipes and the third main middle pipe is connected to the main air outlet pipe by six branched pipes sequentially arranged to form the M-shaped structure, the main air outlet pipe at the rear end is connected to the wind outlet pipe connected out of the baking room by the pipeline.