Cup cover and straw cup using same

The utility model discloses a cup cover which comprises a hard upper cover and an elastic bottom cover, the bottom cover comprises a cover opening and a bottom, an elastic boss extends out of the inner wall of the bottom cover towards one side of the axis of the bottom cover, the boss and the inner wall of the bottom cover define a containing cavity used for installing the upper cover, and the bottom cover is provided with an opening. The upper cover is embedded and buckled in the accommodating cavity and is hermetically fixed with the peripheral wall of the accommodating cavity; a boss is arranged on the bottom cover, a straw hole and an air hole are vertically formed in the boss, the straw hole and the air hole both penetrate through the bottom of the bottom cover, a straw is inserted in the straw hole in a penetrating mode, the straw is tightly matched with the straw hole, and a plug used for blocking the air hole is detachably installed on the air hole. The cup cover is simple in structure, the hardness o