A clip for fixing a mat of a carpet of a vehicle that prevents the clip once mounted to a carpet from being detached to improve the coupling force, by fixing the clip to the carpet in the form of a cable tie. In particular, the clip for fixing a mat of a carpet of a vehicle further enhances the coupling force of fixing the clip to the carpet to prevent weakening of the coupling force of the clip or detachment of the clip even when an external force is applied to the carpet, by forming a tongue section to further enhance the coupling force of the clip while being extended as the carpet is pressed on the mat.