The utility model relates to a lightweight coaxial trailing cable. Conductor, a plurality of coaxial assemblies are distributed on the periphery of the conductor. The coaxial assembly sequentially comprises an insulating layer, a shielding layer, an inner sheath, an armor layer and an outer sheath from inside to outside, the thickness of the insulating layer ranges from 0.1 mm to 1 mm, the thickness of the shielding layer ranges from 0.2 mm to 1 mm, the thickness of the inner sheath ranges from 0.3 mm to 1 mm, the thickness of the armor layer ranges from 0.5 mm to 1 mm, and the thickness of the outer sheath ranges from 1 mm to 4 mm. Therefore, the seven strands of copper wires are stranded to form the conductor, and the conduction performance is good. Aramid fibers and polytetrafluoroethylene fibers can be selected to be matched with each other, and a good armoring effect is achieved. The overall mass is light, the breaking force is high, and the use condition of the frequency below 200 MHz can be effectively met. The independent polyurethane layer is used as the outer sheath, so that the flexibility of the cable is ensured, the vulcanization construction can be conveniently carried out on a use site, and the applicability and maintainability of the cable are improved.