Polyethylene terephthalate is used in PET barrels, which will do harm to human body if used repeatedly. This is because in the process of repeated use, PET barrels will be worn, deformed or polluted, which will lead to chemical leakage or bacterial growth. These substances and bacteria will have adverse effects on human health. In order to protect the health and safety of consumers, the state explicitly prohibits the reuse of PET barrels. In order to avoid potential health risks, we should abide by relevant regulations and do not reuse pet barrels.