A label tag cord made of plastic material is used as a connector between the label tag and the product, or as an independent identifier. The label tag cord includes a linearly extending and pliable cord body. First and second positioning parts are configured at opposite ends of the cord body. The preset area between the first and second positioning part form an extended block area having width and thickness larger than the cord diameter. The extended block area correspondingly defines a first surface or second surface, at least one of which forms an identifying surface. The extended surface can provide text and image layout. A display unit has a surface containing protruding or concaving parts or paste area. The text and image display unit can be a trademark, pattern, or image. The label tag cord can help to produce brand value, increase advertising effect, and enhance product value.