The invention discloses a method for preparing a graphene fabric electrode and a yarn electrode and an application thereof in a supercapacitor, relating to a preparation method of an electrode and anapplication thereof in a supercapacitor, and mainly aiming to solve the problem that no method can be used to simultaneously prepare flexible electrodes based on ordinary textile fabrics and yarns atpresent. The method includes the following steps: adopting stannous chloride to perform sensitization treatment on polyester fabrics and yarns for ordinary textiles, preparing fabric/graphene fabric electrodes and yarn/graphene yarn electrodes, and preparing conductive polymer/fabric/graphene fabric electrodes and conductive polymer/yarn/graphene yarn electrodes that are applied to flexible supercapacitors. According to the preparation method disclosed by the invention, the flexible electrodes based on the ordinary textile fabrics and yarns can be simultaneously achieved; and symmetrical supercapacitors assembled by the fabric electrodes and the yarn electrodes also show excellent electrochemical performance. The invention belongs to the technical field of nano materials.