This ear tag has excellent waterproof and anti-corrosion performance, is suitable for harsh breeding environments, and ensures long-term stable use. The TPU flexible material design reduces the irritation to the sheep's ears, improves the wearing comfort, and at the same time enhances the wear resistance and anti-detachment performance. The read-write function supports the update of data throughout the entire breeding cycle, meeting the full-process traceability requirements from the identification of young livestock to the management of adult livestock.