The utility model discloses a supporting tackle for replacing a strain insulator string. The device comprises a supporting shaft and a main pulley, the main pulley is sleeved on the supporting shaft;rotatable about a support shaft, the two ends of the supporting shaft are fixed to the clamping plates on the two sides of the supporting shaft respectively. An auxiliary pulley is arranged below themain pulley, the auxiliary pulley is arranged between the clamping plates, a rope penetrates through a gap between the main pulley and the auxiliary pulley, a lifting hook is arranged above the main pulley, the outer sides of the two clamping plates are connected with a supporting frame, the supporting frame can rotate relative to the clamping plates, and turning feet used for being hung on an insulator series connection plate are arranged on the supporting frame. Grooves are formed in the turning feet, the grooves can be connected with the insulator series connection plate, and connection points are used as supporting points, so that the supporting frame and the yoke plate can freely rotate to reach the optimal supporting surface, and the turning feet are firmer and more reliable; the auxiliary pulley at the lower end of the tackle effectively reduces friction, guarantees personal safety, and enables the pulley to work more efficiently.