The invention discloses an improved robot cable, which comprises a cable core, wherein the cable core is formed by twisting a filling cotton rope at the center and inner, middle and outer three insulating wire core layers towards the left; the inner, middle and outer three insulating wire core layers are concentrically arranged outside the filling cotton rope by employing the filling cotton rope as the circle center and are formed by three kinds of insulating wire cores with different structures; non-woven fabric wraps the outside of the cable core towards the right; and an elastomer PVC sheath layer is extruded outside the non-woven fabric. The improved robot cable has the characteristics of being simple in structure, light in weight, high in flexibility, high in tensile resistance, bending-resistant and torsion-resistant in use and the like.