Cup cover and thermos cup

A cup cover, wherein the cup cover comprises:

• a cover seat, a water outlet being formed in the cover seat;
• a flip cover assembly, the flip cover assembly comprising a flip cover hinged on the cover seat, a button provided on the flip cover and movable relative to the flip cover, and an elastic member acting on the button and making the button away from the flip cover, 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;
• when the movable lock is in the locked position, the blocking part of the movable lock is on a moving path of the button, and the blocking part prevents the button from moving;
• when the movable lock is in the unlocked position, the blocking part of the movable lock is outside the moving path of the button, the button overcomes an elastic force of the elastic member and moves towards the flip cover when the button is pressed, the button is separated from the water outlet, and the button flips with the flip cover,
• wherein the movable lock moves back and forth between the locked position and the unlocked position through horizontal rotation, and
• wherein the movable lock comprises a split ring part, the split ring part sleeves the water outlet, and there is friction force between the split ring part and the water outlet.