The utility model belongs to the technical field of hooks and discloses an adjustable insulator hook. The adjustable insulator hook is characterized in that the adjustable insulator hook includes a hook body with rope-pass holes and a hook head, wherein the rope-pass holes include two rope-pass holes which are in top-down arrangement. An end portion of a pull rope penetrates an upper rope-pass hole, and winds a lower rope-pass hole, and then penetrates the upper rope-pass hole again. When an insulator is hung on the adjustable insulator hook, under the pull effect of the insulator, two strands of the pull rope arranged inside the upper rope-pass hole are stressed in upward and downward directions which are perpendicular to the axial direction of the rope-pass holes, and the two strands of the pull rope abut against the periphery of the upper rope-pass hole, thus, the pull rope is difficult to slide. When the length of the pull rope is needed to be adjusted, the pull rope can be loosened along a direction perpendicular to the direction of the rope-pass holes to adjust the length of the pull rope, enabling more convenient adjustment.