Biomass reversal-combustion heating bath gasification furnace

The utility model relates to a gasification furnace, in particular to the gasification furnace which can be used in two ways with straws and coal combustion, integrates a cooking stove into one and has the functions of cooking, heating, batching and the like. The gasification furnace comprises a furnace body, wherein a water jacket is arranged at the periphery of the furnace body; a heating water outlet, a heating water return port, a water-discharge heat inlet and a water-discharge heat outlet are arranged on the water jacket; the furnace body is internally provided with a gasification chamber, a main combustion chamber, a heating chamber and a lower smoke suction channel; the gasification chamber is communicated with the main combustion chamber by a sliding plate; a big cooking stove is arranged above the main combustion chamber; a small cooking stove is arranged behind the big cooking stove; water jackets are arranged at the peripheries of the main combustion chamber, the big cooking stove and the small co