Ventilation system for livestock breeding house

The invention discloses a ventilation system for a livestock breeding house, which comprises an in-house air duct arranged in the livestock breeding house and a plurality of terrestrial heat exchange air ducts used for supplying air to the in-house air duct. The terrestrial heat exchange air ducts are arranged underground and used for conducting heat exchange with terrestrial heat, and the terrestrial heat exchange air ducts are connected with the in-house air duct through transition air ducts. A plurality of air inlets for supplying air into the livestock breeding house are formed in the in-house air duct, and a plurality of air outlets for discharging air are formed in the livestock breeding house. Fresh air outside the house exchanges heat with terrestrial heat through the terrestrial heat exchange air ducts, then enters the in-house air duct and is fed into the livestock breeding house through the air inlets, so that the temperature and the air quality in the livestock breeding house meet breeding require