Fresh air system for livestock breeding

The utility model provides a fresh air system for livestock breeding, and mainly relates to the field of ventilation and environmental protection of livestock breeding houses. A fresh air system for livestock breeding comprises a plate-fin heat exchanger, a ventilation pipeline is arranged on the rear portion of the plate-fin heat exchanger, a square air supply fan is arranged on the front portion of the plate-fin heat exchanger, an air suction pipeline is arranged on the right side of the plate-fin heat exchanger, and an air outlet pipeline is arranged on the left side of the plate-fin heat exchanger. The plate-fin type heat exchanger has the advantages that the plate-fin type heat exchanger is adopted, the air volume is large, the heat exchange efficiency is high, electric energy consumption is not needed, energy is saved, and the environment is protected; the plate-fin heat exchanger is internally provided with an active carbon filter layer and an active manganese filter layer, so that pollutants such as s