Abstract: Disclosed is a cup lid assembly, including: a cup lid body provided with a catch; a flip cover connected with the cup lid body in a flipable mode, the flip cover being provided with an elastic member; and a button connected with the flip cover and capable of translating on the flip cover, the button being capable of moving to a locking position or an unlocking position, the button being provided with a hook, the elastic member being connected with the button; wherein the elastic member keeps the button at the locking position; when the button is at the locking position, the hook is connected with the catch and limits the flip cover from being opened, and when the button moves to the unlocking position, the hook is separated from the catch.