NOVELTY - Tobacco stem biomass is produced by (A) collecting raw material; (B) preserving raw material; (C) drying raw material; (D) crushing the raw material; (E) pre-treating the raw material; and (F) extruding and forming. The step (A) employing centralized and rational collecting mechanism to collect raw materials and centralizing tobacco stem raw material in tobacco region to the field. The step (D) includes using a crushing and kneading device to crush raw material. The step (E) includes employing piling method to pre-treat raw material and fermenting crushed tobacco stems.    USE - Method for producing tobacco stem biomass (claimed) used in heating devices for roasting tobacco leaves.    ADVANTAGE - The method is rational and has low cost. The produced biomass meets demand of cleaning energy source. It is convenient and available to collect tobacco stem.    DETAILED DESCRIPTION - Tobacco stem biomass is produced by (A) collecting raw material; (B) preserving raw material; (C) drying raw material; (D) crushing the raw material; (E) pre-treating the raw material; and (F) extruding and forming. The step (A) employing centralized and rational collecting mechanism to collect raw materials; building processing field in a range of 10 km in centralized tobacco region; and centralizing tobacco stem raw material in tobacco region to the field. The step (B) employing bundling piling manner to store raw material so that fuel is not rotten even in the rain and gradually removing soil block at tobacco stem root. The step (C) includes arranging fuel in rain at early stage to dry raw material; removing wax from surface of tobacco stem so that it is easy to move to open shed and dry at rear stage; and controlling moisture rate of tobacco stem raw material. The step (D) includes using a crushing and kneading device to crush raw material, processing raw material into long filaments not grains so as to guarantee easiness for processing biomass formed fuel and keeping form in consequent transportation. The step (E) includes employing piling method to pre-treat raw material and fermenting crushed tobacco stems. The step (F) includes using extruder to extrude tobacco stem raw material in previous step into biomass formed fuel.