Cup cover with key protection lock

The utility model relates to a cup cover with a key protection lock. The cup cover with the key protection lock comprises an upper cover, a bottom cover, a stopper and a key device, wherein the rear end of the upper cover is connected with the rear end of the bottom cover in an overturn mode around a pin shaft through a torsion spring, the key device is arranged at front ends of the upper cover and the bottom cover, and the bottom cover is rotatably fixed on a cup body; the key device comprises a key and a warped plate, the key can slide up and down relative to the warped plate, the warped plate is installed on a concave portion of the front end of the bottom cover through a pin, the lower end of the warped plate is in compressing connection with cover wall of the concave portion through a flexible spring, and the upper end of the warped plate and a limiting shoulder of the concave portion are connected in a limiting contact mode; a clamp hook is disposed at the front end of the upper cover, a lock hook is mo