A lock device with an electric locking function includes a latch head slideably mounted in a case and an unlatching mechanism mounted in the case. The unlatching mechanism includes a follower portion operatively connected to the latch head. The unlatching mechanism further includes a locking mechanism having an electric driving device for driving a locking block to move between a front position in which the unlatching mechanism is locked and a rear position in which the unlatching mechanism is not locked. Wire or wireless control can be provided to control a driving shaft of the electric driving device to move in a forward direction or a reverse direction to lock or unlock the latch head.