Cable accessories are mainly divided into three categories: terminals (outdoor terminals, indoor GIS terminals, transformer oil immersed terminals, etc.), connectors (cable intermediate junction boxes, ordinary connection boxes, insulation connection boxes, connection pipes and terminals, etc.), and plug connectors (oil filled cable accessories). Due to the absence of oil, cross-linked cable accessories only have terminals and connectors. Of course, if there is a connection between cross-linked cables and oil filled cables in the circuit, this transition joint can be regarded as a plug joint for cross-linked cables, and there is currently no such demand in China. The difficulty of terminal manufacturing is significant, and the high-tech content is much higher than that of the cable body. This part of the entire operating system of the cable is a weak link. When designing and manufacturing it, great attention should be paid to the electric field distribution, temperature distribution, and pressure distribution of the joint part, absolutely eliminating air gaps. The mold design is extremely complex, and the application of material formulas is also difficult. Famous foreign manufacturers such as ABB, BICC, ALCTEL, PIERELLI, Guhe, Sumitomo, etc. are internationally leading in accessory design and manufacturing, but their products are only supplied together with the cable body and not sold separately. Therefore, it is necessary to introduce production equipment for high-voltage XLPE power cable accessories and submarine cable flexible joint technology