The utility model discloses a straw gasification heating furnace used for tobacco leaf curing, comprising a furnace body; the periphery of the furnace body is provided with a shell which is used for enclosing the furnace body; a cavity used for heating the air is formed between the shell and the furnace body; an air outlet used for discharging the heated air is arranged on the side wall of the shell which is near and is connected with a heating chamber, and an air inlet is arranged on the other surface corresponding to the air outlet. The structure has the advantages that as the shell is enclosed around furnace body, the cavity between the shell and the furnace body can make full use of the heat of the furnace body to heat the air in the cavity; in actual use, the air outlet is communicated with the air heating chamber and the heated air can be guided into the air heating chamber by a draft fan which is arranged between the curing barn and the air heating chamber, thus the heat energy can be fully utilized and effectively saved and the furnace has good popularization and application value.