The lightning arrester insulators are a two-in-one product with a new composite structure, adopting a design philosophy of "first blockage, then unblocking." This enhances their insulation performance and anti-contamination level, making them suitable for overhead line insulation supports. They also have protective functions against lightning strikes that could cause overhead insulated conductors to break, porcelain insulators to shatter, and reduce the likelihood of lightning-induced tripping. The principle is: when the lightning overvoltage exceeds a certain value of the insulation blockage, a flashover discharge is induced between the arc rod and steel foot of the lightning arrester pillar, forming a short-circuit path. The subsequent power frequency arc then burns at the discharge gap to protect the conductor from burning. When used with insulated wires, this product also features a piercing power supply function, making installation and construction extremely convenient and reliable. It avoids wire core moisture and corrosion without removing the insulation layer, also reducing the physical strain on the installer. By integrating the pillar insulator and lightning arrester fittings into one (at the same potential), it is unaffected by the ring network supply load side (the side away from the power source), which further simplifies and beautifies the line while reducing costs.