Bottle cap

The utility model discloses a bottle cap, which comprises an upper decorating cap and a lower cap; the inner wall of the upper decorating cover is provided with internal threads; an upper liquid sealing ring is arranged at the lower part of a top plate of the upper decorating cover; the outer wall of the upper half of the lower cover is provided with external threads; the internal threads are matched with the external threads; a layer of transverse sealing fin is arranged in the centre of the lower cover; a ring of tearing and bracing wire is arranged at the periphery of the sealing fin; a pull ring is arranged above the sealing fin; and a ring of convex buckle edge is arranged on the inner wall of the bottom of the lower cover. By adopting the bottle cap, the lower cap of the bottle cap is buckled below a convex ring of a bottle neck and fixed on the bottle neck; when the bottle is required to be opened, the upper decorating cover is only required to be unscrewed, and then the pull ring is pulled to pull dow