The bottle reverse sterilizer cleans inside the bottle mouth and cap interiors of PET bottles after they have been filled with juice and tea beverage. The device implements both the conveying chain system and bottle reversing chain system. A bottle support reversing guide rod is included. The machine sterilizes and resets automatically. During sterilization, the bottle mouth and cap interior are processed at high temperatures without additional power sources, reducing energy consumption. The bottle reverse sterilizer has a streamlined exterior and is crafted entirely from SUS304 stainless steel.