The invention discloses a signal cable for a high-definition digital product. The signal cable comprises five inflaming-retarding polyether type thermoplastic polyurethane elastomer lining cores including a middle block with the square cross section and four circumferential fan-shaped blocks. A fiber cable core is arranged in the middle block. Multiple different specifications of power supply wire cores re arranged in opposite two fan-shaped blocks. Control cable cores are arranged in other opposite two fan-shaped blocks. A polyaryletherketone ribbon wrapping flame retardant layer, an aluminum-polyethylene adhesive sheath, a silicone rubber inner sheath layer, a mouse bite-preventing metal filament armoured layer and a polysulfone outer sheath layer successively cover the exteriors of the inflaming-retarding polyether type thermoplastic polyurethane elastomer lining cores. The signal cable is novel in structure design and good in structure compactness after cabling. All kinds of function wire cores are easy to differentiate and easy to install and lay. The signal cable is advantaged by small size and light in weight. Stable and reliable communication quality is ensured in a strong electromagnetic field environment.