Abstract: A plug locking device for preventing accidental separation of an extension cord plug from a primary plug wherein the extension plug is mated to the primary plug by means of an insertion prong or receptacle, the invention comprising an elongated strap which is attached to the extension cord plug by insertion of a first prong into a first opening at one end of the strap. This same end includes additional prongs which are used to attach the second end in wrapped configuration about the coupled plugs. This is accomplished by openings in the second end which are positioned on one or more of the prongs at the plug of the extension cord. An intermediate section of the strap is configured in geometry and length to permit it to be wrapped around the combined plugs, with the second end being returned to the site of the first end for attachment.