NOVELTY - A straw charcoal gas producing method involves mixing and combusting raw material with sucked air in a lower-suction carbonization tank under anaerobic condition to carry out complex thermo-chemical reaction energy conversion, followed by depositing produced carbon in a bottom of the tank, and volatilized content generating smoke, which comprising carbon monoxide, methane, and hydrogen under an effect of an induced draft fan. The smoke is induced out with a direction consistent with the raw material dropping direction, followed by filtering tar in the smoke by hot carbon layer.    USE - Method for producing straw charcoal gas.    ADVANTAGE - The method enables producing straw charcoal gas with reduced labor intensity and improved utilization of straw in a simple, easy, inexpensive and eco-friendly manner.    DETAILED DESCRIPTION - A straw charcoal gas producing method involves mixing and combusting raw material with sucked air in a lower-suction carbonization tank under anaerobic condition to carry out complex thermo-chemical reaction energy conversion, followed by depositing 40 wt.% produced carbon in a bottom of the tank, and 60% volatilized content generating smoke, which comprising carbon monoxide, methane, and hydrogen under an effect of an induced draft fan. The smoke is induced out with a direction consistent with the raw material dropping direction, followed by filtering tar in the smoke by hot carbon layer. The tar is cracked. The smoke is transferred to first stage condensate filter, followed by converting gaseous tar to solid liquid dependent on the condenser, increasing flowing time of tar in gravitational flow to automatically transfer tar from first tar outlet to first tar collector, transferring tar and soot water condenser gas to second stage condensate filter under the action of the draught fan, reducing temperature of the gas rapidly when heat radiation area is large. The tar in an inner wall of the condenser is morphologically changed. The flowing time of tar is increased to transfer the tar from second tar outlet to second tar collector, followed by transferring impure combustible gas to third stage condensate filter under the action of the draught fan, transferring the tar from third tar outlet to third tar collector, and filling corn cob grain dust removing agent and adsorbed carbon particles to the resultant product to obtain pure combustible gas after cooling the product.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic illustration of a method for producing straw charcoal gas.