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Aiming at the insufficient conditions of the current research platform for the internal heating mobile bed biomass pyrolysis carbonization test, an internal heating up and down suction mobile bed pyrolysis carbonization test device was proposed, the continuous pyrolysis carbonization process was simulated, and the gas supply system, carbon sampling collection system, product collection system, gas purification system and temperature monitoring system were designed. Using rice husk as raw material, up-suction and down-suction pyrolysis carbonization experiments were carried out to study the effects of residence time and inspiratory mode on internal thermal pyrolysis carbonization products. The results showed that with the increase of residence time, the volatile and fixed carbon contents of rice husk carbon were decreased, the ash content was increased, and the calorific value was decreased. The calorific value of rice husk carbon was decreased from 20.7MJ/kg and 22MJ/kg at 10min to 14.6MJ/kg and 15.2MJ/kg at 60min, respectively. With the increase of residence time, the content of C in rice husk carbon was decreased from 51.9% and 65.3% at 10min to 36.5% and 54.8% at 60min, respectively. The content of N element was decreased from 1.1% and 2.3% at 10min to 0.5% and 0.7% at 60min, respectively. The content of O element was increased from 46.0% and 28.7% at 10min to 61.7% and 42.2% at 60min, respectively. The change trend of H element was not obvious. With the increase of residence time, the specific surface area of up-suction and down-suction pyrolysis rice husk charcoal was increased from 0.73m2/g and 0.78m2/g at 10min to 3.84m2/g and 3.95m2/g at 60min, respectively, and the pore structure of biochar was developed. The test system had reasonable structure, stable and reliable operation, good sealing effect, and can effectively control the test factors such as air intake mode, air intake volume and heat preservation carbonization time. The development of the internal thermal pyrolysis charring platform provided an important condition support for the experimental research of internal heating charring process parameters.