The invention discloses a chemical co-production device of preparing an organic fertilizer from livestock and poultry manures, and belongs to the technical field of organic fertilizer production equipment. The chemical co-production device comprises a homogenization storage tank, a solid-liquid separator, a groove type fermentation tank, a ventilation aeration element, a heat collection element, and a power supply. Through the ventilation aeration element, manures will not enter an aeration pipeline, the aeration pipeline will not be obstructed, the aeration process is guaranteed, and enough oxygen is supplied to the organic fertilizer to ensure the quality of the produced organic fertilizer. By utilizing the ventilation aeration element, air flows out in a spiral form, the wind power is increased, the air ejected in a spiral form is broken into a plurality of air bubbles, and the aeration efficiency is improved therefore. Through a deodorizing element, the odor generated by the fermentation in the groove type fermentation tank is processed centrally; the manures are recycled and reused, the energy consumption and discharge are reduced, and the provided device has the advantages ofuniform aeration, high production efficiency, energy saving, and reduced emission, and is suitable for popularization.