The sludge in the sludge tank enters the vacuum centrifugal drying and dehydration machine regularly and quantitatively through the mud pump. After 1 hour of centrifugal drying, it enters the sludge anaerobic pyrolysis carbonization device. After the pyrolysis gas is fractionated and cooled by the oil separator, we obtain Combustible gas (for self-use of the system after purification) and the solid product obtained after pyrolysis - biochar, can be used as raw materials for biochar fertilizer, and then enter the batching bin machine, and the finished fertilizer is automatically packaged. This process heating system uses waste heat recycling, which greatly saves energy consumption and reduces equipment operating costs. The flue gas generated by the production line is purified by the flue gas purification system and reaches the emission standard.