The invention discloses a method for preparing high-strength cable outer sheath materials. The method includes preparing color master batch; weighing
ethylene-
tetrafluoroethylene copolymers, propylene-
tetrafluoroethylene copolymers, the color master batch, lubricants, antioxidants,
carbon black or
titanium dioxide
powder,
basalt fibers, glass fibers and
graphene according to the weights; mixing the
ethylene-
tetrafluoroethylene copolymers and the propylene-tetrafluoroethylene copolymers with one another, simultaneously heating and uniformly stirring the
ethylene-tetrafluoroethylene copolymers and the propylene-tetrafluoroethylene copolymers until the temperatures of the ethylene-tetrafluoroethylene copolymers and the propylene-tetrafluoroethylene copolymers reach 220 DEG C, preserving heatfor 0.5-1.2 hours and then stopping heating the ethylene-tetrafluoroethylene copolymers and the propylene-tetrafluoroethylene copolymers; placing the glass fibers, the
basalt fibers, the lubricants, the
carbon black or
titanium dioxide
powder and the
graphene into the ethylene-tetrafluoroethylene copolymers and the propylene-tetrafluoroethylene copolymers, uniformly stirring the ethylene-tetrafluoroethylene copolymers, the propylene-tetrafluoroethylene copolymers, the glass fibers, the
basalt fibers, the lubricants, the
carbon black or
titanium dioxide
powder and the
graphene, keeping the temperatures of 35 DEG C unchanged under the control and preserving heat for 1.5 hours to obtain
slurry; feeding the
slurry into a granulator and carrying out stretching, hot
cutting and cooling to obtainthe high-strength cable outer sheath materials. The method has the
advantage that the high-strength cable outer sheath materials prepared by the aid of the method are outstanding in anti-ultravioletand anti-aging performance and excellent in mechanical performance.