Against the backdrop of ISO14001 environmental management system certification, how can the air quality in laying hen farms be improved through scientific ventilation design and ammonia concentration control? This article deeply analyzes the intelligent ventilation system and temperature control mechanism matched with H - type layer hen cages, and comprehensively explains the whole - process management methods of green farming in combination with automatic manure cleaning technology. From policy compliance to practical implementation, it helps farmers reduce environmental pollution risks, increase egg production rates, and provides an executable path for obtaining international environmental protection certification.