Raw material pretreatment mainly includes auxiliary material crushing, fermentation raw material loading and mixing. Auxiliary material powder such as straw Crushed to 3~5cm long. Pig manure in the plant area is transported to the pre-treatment area by pipeline from the pig house (pig manure outside the plant area needs The pig manure and auxiliary materials shall be laid in layers with a thickness of 20cm each, From the inside to the outside, the turning machine is used for uniform turning and mixing, and the fermentation agent is mixed during uniform turning. The fermentation and composting process includes two steps: mixed compost fermentation and secondary composting fermentation, in which the mixed compost Fermentation refers to aerobic fermentation of mixed materials through trough type aerobic fermentation system. Bottom cloth of fermentation tank The ventilation system is set to provide forced ventilation and oxygen supply, and the materials are evenly turned by the tipping machine, which is used to turn and throw once every 3~5 days, The aerobic fermentation period is 30 days. After aerobic fermentation, transport the fermentation materials to the secondary decomposition workshop, Secondary putrefaction refers to the secondary putrefaction of aerobic fermentation products in the form of stacking in strips to achieve organic For the standard of fertilizer maturity, the material shall be evenly turned over with a tipping machine, once every 5~7 days, and the second maturity cycle is 15 days. After secondary decomposition, the material is used to produce powdery organic fertilizer, which is mixed, cooled, screened Packaging, storage and other steps to produce powdered organic fertilizer. After secondary decomposition, the materials are used to produce granular refined organic fertilizer for batching, mixing, granulation and cooling Screening, packaging, storage and other steps to produce granular refined organic fertilizer.