The invention relates to a container for sucking a beverage, comprising a container body, a cover body and a beverage straw with flexible recovery performance, wherein the cover body comprises an inner cover, a drinking valve device and a ventilation opening and closing device, and the drinking valve device is used for opening and closing an inner flow channel and an outer flow channel based on the bending and extending of the beverage straw; the ventilation opening and closing device comprises a ventilation valve port on the inner cover, a floating ventilation valve, bulges and a recess between the two bulges, and the bulges are positioned on two ends of the inner side surface of a slip sheet; the floating ventilation valve is movably installed on the ventilation valve port; and the contact surface of the floating ventilation valve is provided with one or a plurality of elastic bulges. When the slip sheet is completely closed and opened, one of the two bulges on two ends of the innerside surface of the slip sheet is pressed on the floating ventilation valve to extrude the elastic bulges to tightly adhere to the surface of the ventilation valve port for sealing and preventing water. Thus, the ventilation opening and closing device provided by the invention has low requirements for assembling process dimensions, and the floating ventilation valve is convenient to replace.