The invention discloses an insulator hoisting method for a high-voltage transmission line. Firstly, a hoisting pulley is installed on the high-voltage transmission line, and an annular lifting rope iswound on the hoisting pulley; a new insulator is hooked on an insulator hanging frame located on the annular lifting rope on one side of the hoisting pulley close to the ground; an old insulator detached from the high-voltage transmission line is hooked on the insulator hanging frame located on the annular lifting rope on the other side of the hoisting pulley close to the hoisting pulley; the annular lifting rope on one side with the old insulator hooked is downward pulled until the old insulator falls close to the ground; the new insulator on the other side is lifted to a position close to the hoisting pulley; the new insulator is taken down from the insulator hanging frame on the upper part and is installed on the high-voltage transmission line; the old insulator is taken down from theinsulator hanging frame on the lower part so as to finish hoisting of the new and old insulators. The method in the invention not only can improve the insulator hoisting efficiency effectively but canalso improve the safety for hoisting the insulators remarkably.