NOVELTY - Biomass charcoal preparing device has a main structure including top material feeding device, vertical furnace hearth, hot smoke inlet chamber, ash chamber, baked charcoal afterheat recycling chamber, draught fan, combustion chamber, combustion-supporting air inlet, secondary wind inlet pipe, fire grate, driving motor, sealing baffle board, air interlayer, charcoal discharging fire grate, draft fan, fuel gas inlet, flow regulating valve, and outlet flow regulating valve, where 2-16 stages of horizontal fire grates are arrayed inside a cavity of the vertical furnace hearth at intervals.    USE - Biomass charcoal preparing device.    ADVANTAGE - The device is suitable for continuous production and for replacing a small-scale periodically producing charcoal stove and large-scale funnel kiln and energy-saving; has higher heat efficiency, adjustable production capacity, simple operation, and excellent performance; generates emission, which meets the environmental protection requirement; and provides fired charcoal with good quality.    DETAILED DESCRIPTION - Biomass charcoal preparing device has a main structure comprising top material feeding device, vertical furnace hearth, hot smoke inlet chamber, ash chamber, baked charcoal afterheat recycling chamber, draught fan, combustion chamber, combustion-supporting air inlet, secondary wind inlet pipe, fire grate, driving motor, sealing baffle board, air interlayer, charcoal discharging fire grate, draft fan, fuel gas inlet, flow regulating valve, exhausting pipe, and outlet flow regulating valve, where 2-16 stages of horizontal fire grates are arrayed inside a cavity of the vertical furnace hearth at intervals. The top material feeding device is provided on the upper side of the first fire grate on the upper part on one side at the top of the vertical furnace hearth. It uses a chain-belt or a chain-strip conveying way to sequentially spread input combustion materials on the upper fire grate. Two ends of the fire grate on each stage are provided with the sealing baffle board. The hot smoke inlet chamber is provided on the bottom space of the vertical furnace hearth. The ash chamber is provided on the terminal at the bottom. The baked charcoal afterheat recycling chamber is provided on the upper side of the lowest fire grate on one side at the bottom of the vertical furnace hearth. It is provided with the air interlayer respectively on the upper side and lower side and horizontally provided with charcoal discharging fire grate at the middle, where the air interlayer on the upper side is communicated with a pipe of the draft fan; and the air interlayer on the lower side is communicated with the combustion chamber through the tubular combustion-supporting air inlet. The bottom of the combustion chamber is communicated with the hot smoke inlet chamber and the ash chamber. The top of the combustion chamber is provided with the secondary wind inlet pipe to transmit pyrolysis gas and smoke. The secondary wind inlet pipe is provided with the flow regulating valve on the upper part and communicated with the exhausting pipe and draught fan in a controlled manner. The outlet flow regulating valve is provided at the outlet of the exhausting pipe. The draught fan is respectively communicated with the vertical furnace hearth and controlled pipe of the combustion chamber. Two ends of each fire grate are provided with the driving motor corresponding to the sealing baffle board to drive the fire grate to rotate, overturn, and deliver the combustion materials. Every adjacent two stages of the multi-stage fire grates in the vertical furnace hearth are rotating oppositely; and the rotation and the rotation speed of the fire grate are controlled and driven by the driving motor. The fuel gas inlet is provided on an extended structure on one side at the top of the combustion chamber to deliver the fuel gas into the combustion chamber.