The utility model relates to a 550KN three-connection V-shaped suspension insulator string for an extra-high voltage power transmission line. According to the 550KN three-connection V-shaped suspension insulator string, a single tower suspension point is connected with a three-connection 550KN suspension insulator string, and three connection insulators are connected in parallel and combined with each other through various kinds of high-strength link fittings so as to form a V-shaped string structure, and the V-shaped structure is connected with a clamp suspension plate, and as a result, the single-suspension point three-connection V-shaped 550KN suspension insulator string can be formed. According to the 550KN three-connection V-shaped suspension insulator string for the extra-high voltage power transmission line of the utility model, the three connection 550KN insulators at each side of the V-shaped string structure are connected in parallel, and therefore, the strength of the 550KN three-connection V-shaped suspension insulator string can be as high as 1650kN, and the 550KN three-connection V-shaped suspension insulator string can be more reliable and can satisfy requirements of extra-high voltage power transmission line heavy ice areas for the strength of a suspension insulator string, and has a wide application range.