Low-loss stable-phase cable and preparation method and application thereof

The invention provides a low-loss stable-phase cable and a preparation method and application thereof. The low-loss stable-phase cable comprises a silver-plated copper inner conductor, and the silver-plated copper inner conductor is sequentially coated with an ePTFE film, a PTFE film, an inner shielding layer, an inner sheath, an outer shielding layer and an outer sheath. The ePTFE film and the PTFE film form an insulating layer; through the design of the layer structure, the silver-plated copper inner conductor is selected and matched with the ePTFE film and the PTFE film to form the insulating layer, so that the cable can achieve good balance between high strength and low density. The inner shielding layer, the inner sheath, the outer shielding layer and the outer sheath are arranged in sequence, so that the cable still has stability under a vibration working condition to obtain reliable stable signal transmission capability, and meanwhile, the cable has excellent chemical resistance, can be prevented from