High-voltage cross-linked polyethylene insulated power cable (10-35KV) cross-linked polyethylene insulated power cable uses chemical or physical methods to transform polyethylene molecules from a linear molecular structure into a spatial network structure, transforming thermoplastic polyethylene into thermosetting cross-linked polyethylene. This transformation greatly improves its mechanical properties, thermal aging properties, and environmental stress capabilities, and it has excellent electrical properties. It has the characteristics of high conductor normal operating temperature, simple structure, small outer diameter, light weight, easy to use, and is not limited by laying height.