A tablet protector includes a main frame, a matching and a lock, wherein the main frame and matching frame are engaged with each other to protect the periphery of the tablet. The lock is provided to lock and further restrict the position of the main frame and matching frame as to the tablet. Also, the steel cable extends from the lock to lock the tablet at any predetermined location and prevents the tablet (along with the main frame and matching frame) from being stolen and provides a better anti-theft result.