The invention discloses a fiber reinforced functional adhesive tape, a preparation method and a product thereof. The fiber reinforced functional adhesive tape is formed by compounding of an ultrathinfiber bundle and a resin matrix, the thickness of ultrathin fiber bundle is 0.08mm-0.2mm, the width is 10-900mm, the content of the ultrathin fiber bundle is 30-90%, and the content of the resin matrix is 10-70%. The fiber reinforced functional adhesive tape prepared by the method provided by the invention is ultra-thin and ultra-light, keeps the excellent mechanical properties of fiber, can be prepared into products with excellent properties, and also different functional adhesive tapes can be combined to obtain functional materials with multiple functions. The fiber reinforced functional adhesive tape provided by the invention meets the requirements of integrated structural and functional design, has the characteristics of flexible design, wide performance adjustment range, convenient recovery of the thermoplastic matrix, energy saving and environmental protection, and has good industrial application prospects.