The invention belongs to the technical field of a supercapacitor and specifically relates to a fluorescent supercapacitor fiber and a preparation method thereof. By carrying out uniform load on fluorescent dyes and carbon nanomaterial fibers, the fluorescent supercapacitor fiber which is good in flexibility, significant in fluorescence effect and stable in electrochemical performance is prepared.Fluorescent components stably loaded in a fiber electrode allow a fiber device to have an obvious fluorescence effect and visual diversity under dark environment or ultraviolet excitation; and when the fiber device is woven into a fabric, the fabric not only can provide electric energy for a user, but also ensures safety of the user in the night environment, thereby allowing the fibrous energy device and the energy storage fabric woven thereby to have higher practical application value and commercial additional value and a better personalized customization potential.