The invention provides a bottle cap and a bottle combination structure. The bottle cap comprises a cap body, a pull tab, at least one self-destructing part and a connecting part; the pull tab is connected through the self-destructing part and cover a material taking port; the pull tab and the self-destructing part are integrally formed, so that before a material is taken, the material taking portis always in the state of being closed by the pull tab; since the pull tab needs not to be operated for encapsulating when bottling is completed to prevent the pull tab from being damaged by force andimprove the yield of the product; and the pull tab and the self-destructing part are integrally formed on the material taking port, the pull tab is bound to be pulled to cause breakage and damage ofthe self-destructing part when the material taking port is opened, the identification is very easy, the secondary use of a bottle cap is avoided, and the safety and the reliability of the use of the bottle cap are improved. A stopper adding section is arranged below the connecting part, and the bottle cap is installed on a bottleneck through the stopper adding section in advance, the stopper adding section is provided with a ring, close to the edge part of an opening, of the bottle cap, the ring is adapted to the external shape of the bottleneck, the bottle cap and the bottleneck are relatively fixed together without the need to change of the structure of a bottle body, the structure is simple, and the processing cost is lower.