The invention relates to a 550 kN trigeminy V-shaped pendent insulator string form, at a unilateral side, a single iron tower hanging point is adopted to be connected with the trigeminy 550 kN pendent insulator string, and the hanging point and the insulator string are connected in parallel to form a V-shaped string structure through multiple high-strength connecting armor clamps, and then the structure is connected with a cable clamp hanging plate to form a pendent single-hanging point trigeminy V-shaped 550 kN pendent insulator string form. The string adopts trigeminy 550 kN insulators for parallel connection at each side, has the high strength of 1650 kN, is more reliable and wide in application range, and the requirement of a UHV direct-current transmission line heavy ice area on the strength of the pendent insulator string is met.