This invention relates to an air-purify device used for livestock breeding industry which includes intake device, temperature controlling device, humid controlling device, purifying device, scavenging arrangement, releaser and auto-control device that separately combine and adjust. The media of the air-purify device used for livestock breeding industry is the outside natural air. The outside air flows into the airproof intake device, temperature controlling device, humid controlling device by the auto-control adjustment and forms proper temperature and humid with rich oxygen air which flows through the purifying device which can automatically clear dust, clean the thimerosal and discharge pollution. Then these make the new air has proper temperature and humid, rich oxygen, non-germ and make the air inside the house the same as the natural air with fresh, non-germ, rich-oxygen, warm and humid after rain outside house. It lowers the viscosity of the polluted air inside the house and clears the harmful dust by the scavenging arrangement and the releaser. The air inside and outside the house can automatically exchange which makes the new air constantly pour into the house and the waste air out so as to exchange the air. The merits of this invention are 1) it fits many livestock breeding household air purification. 2) It purifies and sanitizes the air efficiently and the merit rating will come to 100 thousand classes after one hour. 3) It has rich oxygen, clearness and no germ and the temperature and humid make people comfortable. 4) It has good production quality, safety, convenience, low price and energy saving. 5) it provides personal design with different styles and kinds that is a new air sanitizing and purifying production.