Abstract: The present application belongs to the technical field of daily necessities, and in particular relates to a cup cover and a thermos cup. Aiming at the defect that the position of the front button of the existing bouncing type cup cover is fixed, the present application adopts the following technical solution: a cup cover, the cup cover including: a cover seat, a water outlet being formed in the cover seat; a flip cover assembly, the flip cover assembly including a flip cover, a button and an elastic member, the flip cover being capable of covering the water outlet, and a clamping structure being formed between the button and the water outlet; and a movable lock, the movable lock being movably provided on the cover seat, the movable lock moving between a locked position and an unlocked position, and the movable lock being provided with a blocking part.