The present invention relates to a digital locking device for preventing an external exposure and, more specifically, to a digital locking device, for preventing an external exposure, which: prevents an intruder in advance by making the installed position of the digital locking device or the installation of the digital locking device unidentifiable in the front side of a door with the naked eye by installing a body part only in the rear side of the door; and prevents an outsider from easily trespassing by setting a timer or enabling a resident to install a reader in the rear side of the door by freely selecting the position of the reader even though the outsider acquires a recognition means which the resident lost. The digital locking device for preventing an external exposure, to open and close a door by being installed in the door, according to the present invention includes: a body unit which is installed to be attachable to and detachable from the rear side of the door in order not to be exposed to the front side of the door; a recognition unit which recognizes a recognition means by being installed in the inside or outside of the body unit; an opening and closing unit which opens and closes the door by being installed inside the body unit in order to be able to move in and out; a control unit which controls the recognition unit and the opening and closing unit; and a power source unit which applies power on the recognition unit, the opening and closing unit, and the control unit.
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