The present invention discloses a high strength light marine cable and the preparation method thereof, which comprises a cable core, a tapping layer, a braid layer and a protective sleeve. The external of the cable core is covered with the tapping layer, the braid layer and the protective sleeve in turns; the cable core is composed of three transmission line cores, which comprises a tinned / bare copper flexible conductor and an insulating layer; and stuffing is used to stuff between the three transmission line cores and the tapping layer. According to the present invention, Nomex and tinned copper wires are mainly used to weave together, instead of the traditional marine cable with stainless steel wires or tinned copper wire braid layers, which can greatly decreases the weight of the cable and at the same time improves the tensile properties of the cable. The braid layer of tin plating copper wire can eliminate the potential for induction of cable surface and good grounding protection and play a role in the protection of the facilities and personnel safety, aramid can play to good mechanical protection and tensile in the process of laying, and ensure that the cable good bending performance, so as to ensure the products in the repeated bending or long-term minimum bending radius for use under the condition of fracture.