A button locking mechanism includes a latch for being pushed in a first direction by a driving component, and a blocking component connected to the latch. A first incline structure is formed on the blocking component for contacting against a button when the blocking component moves in the first direction so that the blocking component moves in a second direction substantially perpendicular to the first direction. The button locking mechanism further includes a first elastic component connected to the blocking component for pushing the blocking component to move in a third direction opposite to the second direction so as to prevent the button from being pressed down.