A cup cover comprises a cover body, the top end of the cover body is detachably connected with a plugging piece in a clamped mode; a concave area is arranged in the middle of the top end of the cover body, a first air hole is formed in the concave area, an arc-shaped concave part is arranged on one side edge of the concave area, and a positioning cylinder is arranged on the cover body on the outer side of the arc-shaped concave part; a mouth drinking opening and a tube inserting opening are symmetrically formed in the periphery of the cover body, and a clamping groove is formed in the position, corresponding to the clamping position, of the inner side of the cover body; the plugging piece comprises a first plugging convex part which is arranged at the position, corresponding to the
intubation tube opening, of the plugging piece and used for plugging the
intubation tube opening; the first plugging convex part and the second plugging convex part are respectively in
interference fit with the tube inserting opening and the mouth drinking opening, and the food-grade
silica gel sealing ring is embedded in the sealing ring groove at the
tail end, so that double sealing guarantee is formed, liquid leakage can be effectively prevented, and even if a container is inclined and inverted,
safe storage of the liquid can be ensured; the liquid packaging bag is suitable for various liquid packaging scenes with high sealing performance requirements.