The present invention relates to an automatic horizontality detector being detachable from an electric drill with a level meter, which can automatically show an unskilled user that the drill is at the ready to drill a hole. The automatic horizontality detector according to the present invention includes: an attaching and detaching unit which is detachably attached to a body of an electric drill; a body unit connected with the attaching and detaching part; a camera unit disposed at one side of the body unit; a control unit located inside the body; a memory unit interworking with the control unit; and a display unit interworking with the control unit and attached to the outside of the body unit.
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