Multifunctional bottle cap

The utility model relates to a multi-function bottle cap in the inner cavity of the body of which is equipped a post-shaped charging device, which has an immovable connection with the inner cavity and at the bottom end of which is equipped an underseal, and at the bottom end of the body of which is equipped a cap opening connecting the bottle mouth, and at the roof end of the body of which is equipped an opening of the post-shaped charging device wherein an opening device the bottom end of which connects the underseal of post-shaped charging device and the roof end of which is below or equal to the roof end of bottle cap body covered with a seal film, covering the roof end of bottle cap body and the opening device, outside which is equipped an upper gland, covering the roof end of bottle cap body, the roof end of opening device and the seal film, between which and the bottle cap body is equipped a anti-separation raised clamp to prevent the upper gland from taking off and at the bottom end of which is equipped an insurance ring to prevent the upper gland from being pressed down and the on bottom end plane of the roof plane of which is equipped a roof block. The utility model utilizes the seal mode performed by a seal film to be characterized in convenience, reliability, simple structure, lower cost and easy opening.