On the basis of applying the theoretical achievements of ecological agricultural technology, livestock and poultry organic fertilizer is formulated into crop organic fertilizer by using the livestock and poultry manure fermented and dried in large farms, as well as industrial and agricultural production residues such as plant ash, furfural residue and weathered coal, adding excellent biological agents, and adopting relatively mature organic fertilizer production technology.

In the production line for preparing organic fertilizer from pig dung sewage and pig dung, the sewage filtration equipment includes a shell, which is divided into a primary filtration unit, a secondary filtration unit and a tertiary filtration unit by two partitions. Filter pools are set in the primary, secondary and tertiary filtration units, and the upper end faces of the filters located in the primary, secondary and tertiary filtration units are gradually reduced in sequence, Overflow holes are respectively set on the two diaphragms to conduct the primary filter unit, the secondary filter unit, and the tertiary filter unit. The bottom of the filter tank is equipped with a water inlet and sewage discharge chamber, and one side of the primary filter unit is equipped with a water inlet channel connected with the water inlet and sewage discharge chamber; The middle and lower parts of the septic tank are connected with the water inlet channel through pipelines;