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Biochar plays a significant role in improving soil properties, promoting restoration of the cultivated land, fixing carbon and reducing emissions, improving the environment, and alleviating the energy crisis. Aiming at the problems of uneven temperature, difficult purification of pyrolysis gas and high energy consumption of traditional carbonization process, a small charring kiln with biomass stirring and pyrolysis reigniting mechanism was designed. The main structure of the kiln included combustion chamber, carbonization chamber, preheating chamber, dual-spiral agitator, and motor. A dual helix auger structure was employed to facilitate the circulation of biomass. By utilizing smoke exhaust technology, the recirculation of exhaust gases back to the combustion chamber for ignition was achieved. This approach not only reduced tailpipe emissions but also decreased the energy input required during carbonization. A prototype simulation model was established and vector analysis on the temperature field and heat flow field of the carbonization furnace was performed based on computer simulation technology. The calculation results indicated that the temperature distribution inside the furnace was uniform. The biomass carbonization experiments were conducted by using rice husks with this charring kiln. The results showed that the biomass can be ignited with the leaded back combustible exhausted gases produced in charring process, and it can keep the temperature within the carbonization chamber in the range of 420℃ to 470℃, which met the requirements for carbonization. Orthogonal experimental results indicated that under certain conditions, the optimal combination of factors for the highest carbonization rate were spiral mixer speed of 43 r/min, material filling coefficient of 88.68% in the carbonization chamber, and carbonization time of 15 min. The highest carbonization rate achieved 50.86%. These research findings can serve as a reference for biomass carbonization technology.