The invention relates to an eight-bundle large-section wire tension stringing pulley hanger and a dismounting and mounting method thereof. The pulley hanger is of an isosceles trapezoid multi-layer frame structure. Two ends of the upper bottom of the isosceles trapezoid are respectively provided with hanging plates B used for being connected with a V-shaped insulator string; four hanging plates Aare evenly installed on the lower bottom of the isosceles trapezoid in a length direction, two of the hanging plates A are installed at the two ends of the lower bottom of the isosceles trapezoid, each hanging plate A is connected with a paying-off pulley through a parallel hanging plate, and the four paying-off pulleys are hung on the pulley hanger at equal height. Thus, the arrangement and hanging mode of four sets of three-wheel paying-off pulleys hung on each pole of a tower becomes simple, and the tension stringing pulley hanging construction efficiency is improved; meanwhile, the key problems that the pulley hanging heights are difficult to adjust to be equal, sag observation is difficult, and accessory installation efficiency is poor due to a conventional pulley hanging mode in stringing construction are well solved; the problem that a steel wire rope sleeve is basically scrapped after being singly used for hanging a project is solved, repeated use is achieved, and constructioncost is reduced; and in comparison with the conventional hanging pulley, the hanging points are reduced, and potential safety hazard points are reduced.