The present invention discloses a flexible flat cable, including a single low-dielectric mixed material layer, a plurality of conductor, two conductive material layers and two insulating protective layers. These conductors are located inside the single low-dielectric mixed material layer and are spaced apart. The two conductive material layers are laminated individually to the upper and lower surfaces of the single low-dielectric mixed material layer. The two insulating protective layers are laminated individually to the two conductive material layers.