NOVELTY - Biomass fuel gas and biomass charcoal preparation system comprises three sequential working units consisting of feeding unit (1), pyrolytic reaction unit (2) and discharging unit (3). The feeding unit is provided with helical feeding device having helical blades with varying density. The pyrolytic reaction unit is provided with pyrolytic reaction body (21), helical propulsion device (22), and air supply device (23) arranged in pyrolytic reaction body. The discharging unit comprises helical discharging device (32) and air feeding system (33).    USE - Biomass fuel gas and biomass charcoal preparation system.    ADVANTAGE - The system accurately controls biomass thermal decomposition efficiency. Specifically, it accurately controls, integrates and optimizes material height, material propulsion speed, and pyrolytic reaction temperature and intensity; improves pyrolysis efficiency; prepares biomass fuel gas and biomass charcoal with good and stable quality; can treat wide-ranging biomass and organic wastes; and has high automation level.    DETAILED DESCRIPTION - The helical feeding device is provided with feeding height regulating device (43), gas mixing device (44), helical propulsion speed regulator (41), reaction monitoring device (45), and air supply controlling valve (42). The air supply device is provided with several holes box at bottom of pyrolytic reaction body, which is provided with hot wind clamping sleeve (24), air guiding blades, and strengthening heat transfer tendon plate. The system also comprises water cooling sleeve (31) arranged outside of helical discharging device; tar particle capturing and sorting devices provided inside of air feeding system; biomass fuel gas outlet (26) arranged above pyrolytic reaction body; biomass charcoal outlet arranged below at back end of pyrolytic reaction body; and condensing units arranged around pyrolytic reaction body. The pyrolytic body is angled from horizontal surface at 1-30 degrees .    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of biomass fuel gas and biomass charcoal preparation system.    Feeding unit (1)    Pyrolytic reaction unit (2)    Discharging unit (3)    Pyrolytic reaction body (21)    Helical propulsion device (22)    Air supply device (23)    Hot wind clamping sleeve (24)    Biomass fuel gas outlet (26)    Water cooling sleeve (31)    Helical discharging device (32)    Air feeding system (33)    Propulsion speed regulator (41)    Air supply controlling valve (42)    Feeding height regulating device (43)    Gas mixing device (44)    Reaction monitoring device (45)