Easy-to-bleed sealing bottle cover

The utility model relates to a food packing bottle, in particular to an airproof bottle lid used for convenient air drainage on vacuumized food with the purpose of fresh-keeping. The utility model comprises an air drainage valve which is composed of a leaf spring and a seal sleeve, wherein one end of the air drainage valve on which the spring is arranged is welded to the inner bottom surface and the other end is sheathed with a seal sleeve and then compressed onto the raised rim of the air drainage vent of the bottle lid and a pressure sensitive label is sticked to the air drainage vent on the surface of the bottle lid. When the bottle is vacuum contained or has high negative pressure inside, removing the pressure sensitive label on the air drainage vent of the bottle lid surface will cause the leaf spring of the air drainage valve to open automatically and then air will go into the bottle, thereby the bottle lid can be easily tweaked open.