Disclosed is a cable tie including a tie band which is formed in a shape of a strap to bind cables, and is provided with a plurality of serrated grooves continuously formed on a one surface thereof in a longitudinal direction, and a tie holder which is connected to one end of the tie band and includes a tie band passage, through which the other end of the tie band passes, and a serrated locking protrusion formed on an inner surface of the tie band passage and interference-latched to the serrated grooves. The tie band is provided with a cut guide groove formed on one or both widthwise edges thereof, so that a free end of the tie band remaining when the tie band binds the cables together is cut off by a rotating force generated when the free end is twisted, without using a cutting tool.