Cover reliable in sealing

The utility model discloses cover reliable in sealing. The cover reliable in sealing comprises a cover main body. A guide sliding barrel is arranged on the top of a cavity of the cover body. A wooden plug is matched inside the guide sliding rank in a sliding mode. A positioning table is arranged on the top of the guide sliding barrel. A spring is arranged between the wooden plug and the top of the guide sliding barrel. The spring is sleeved into the positioning table. An outlet at the lower end of the guide sliding barrel is an inclined contracting mouth. With adoption of the technical scheme, compared with the prior art, the cover reliable in sealing has the advantages that by covering the cover on an outer side wall in a rotating mode, the wooden plug plugs and seals a bottle mouth, the wooden plug is stably pressed on the bottle mouth, no matter how high the pressure inside a bottle is, sealing of the wooden plug on the bottle mouth can be guaranteed, and the wooden plug cannot leave the bottle mouth by im