Air filtering system for pig house

The utility model discloses an air filtering system for a pig house. The air filtering system comprises a fan arranged outside the pig house, ventilation pipelines, a ventilation opening, an air inlet chamber, a ventilation chamber, an air filtering device and a temperature regulating device, wherein the ventilation pipelines and the ventilation opening are laid in the pig house; air is fed into the pig house by the energy-saving fan in a positive pressure form; at least one ventilation pipeline is laid in the pig house; the ventilation opening adopts a rectangular gradual-retraction form; the air filtering device is arranged in the air inlet chamber and comprises three layers of air filtering layers including a primary efficiency filtering layer, a medium-efficiency filtering layer and a high-efficiency air filtering layer; an air conditioner is arranged in the ventilation chamber and is used for regulating the temperature of air entering the ventilation pipeline. According to the air filtering system disclosed by the utility model, dust entering the pig house is effectively reduced, so that germs attached to the dust are stopped, and the probability that pigs are infected to disease is reduced; in addition, the air filtering system is convenient for manual adjustment, so that production benefits of the pigs are increased; compared with the traditional ventilation system for the pig house, the ventilation system for the pig house, disclosed by the utility model, has higher economic benefit in the long term.