Plastic bottled beverages have always attracted consumers with its good storage performance and repeated use. Many people even use beverage bottles for storing daily condiments. However, current generic bottle cap designs may have defects and can directly lead to beverages. Sub-pollution" - the thread of the bottle mouth and the bottle cover mold. This is a certain flaw in the sealing structure. In fact, the currently used plastic beverage bottle sealing structure does not protect the hygiene of the threaded part of the bottle mouth, because the threaded part of the bottle mouth is not sealed and protected. With regard to the problem of prolonged mildew in PET bottles, it is currently a major problem that has plagued the beverage industry. There has been no effective solution. Recently, a new type of sealing structure design has attracted the attention of some industry players. The seal structure adds a seal at the bottom of the lid without changing the existing bottle top seal structure and sealing effect. The thread of the bottle mouth is protected to avoid contamination in the circulation and sales process, thereby eliminating the safety and hygiene hazards of the threaded part of the bottle mouth. At the same time, because the bottom of the lid is sealed more, the chance that the beverage itself is contaminated and becomes defective will be greatly reduced. The sealing structure is suitable for the sealing of various beverages. The cost of its production has not increased substantially in comparison with current technology in the long run.