The invention discloses a high-strength cable and a preparation method thereof. The cable comprises a core material stranded by 20 single copper alloy wires, wherein an insulating layer is arranged outside the core material, and an enhancement layer is arranged on the outermost layer; the cable prepared by the process has good flexibility and high strength, so that the cable has bending resistance and winding capability, can be bent repeatedly when in use and can be used for improving the environmental adaptation.