Composite Insulators, with their lightweight design, excellent anti-pollution performance, and strong resistance to human damage, have gained increasing popularity among users and have emerged as the main force in the insulation industry for urban and rural network transformation projects. As the primary requirements for insulators, both external insulation performance and stable mechanical properties are crucial, and neither can be compromised. Therefore, studying the mechanical properties of composite insulators is a vital step in expanding their market. The external insulation of composite insulators is provided by silicone rubber, with the mechanical load mainly supported by the internal glass fiber pulling rods, which also involve the connection with hardware components. Thus, the research and analysis of the mechanical properties of composite insulators are key to safe operation. Composite insulators rely on the mechanical load-bearing capability of unidirectional glass fiber reinforced resin pulling rods (commonly known as core rods). The outstanding characteristics of the glass fiber pulling rods are their high tensile strength and specific strength.