The invention provides a lightning protection triple tension insulator string, which is light in structure, optimal in stress state, convenient to install and capable of tolerating lightning short-circuit current and is excellent in performance. The lightning protection triple tension insulator string comprises insulators and tension wire clamps, and is characterized in that the three insulators are arranged in an equilateral triangle mode, wherein the upper layer is provided with two insulators, and the lower layer is provided with one insulator; one ends of the three insulators are connected with three ball head hanging rings respectively, the three ball head hanging rings are connected at one side of a one-to-triple plate, the other side of the one-to-triple plate is sequentially connected to a single-to-double parallel hanging plate and a right-angle hanging plate; the other ends of the three insulators are connected with three socket hanging plates respectively, the three socket hanging plates are connected at one side of a triple-to-triple plate respectively, and each end of the other side of the triple-to-triple plate is sequentially connected to a double-to-single corner hanging plate, a single-to-double parallel hanging plate, an adjustable hanging plate and the tension wire clamp. The whole hardware fitting string is simple in structure and convenient to install, and the string type structure meets the requirements of reliability, safety, flexible rotation, and abilities of not touching or being blocked under various operating conditions.