The invention discloses a method for damping vibration of power transmission towers on the basis of double-pendulum vibration dampers. By the aid of the method, the technical problems of small vibration damping frequency ranges of tuning vibration damping technologies currently applied to damping vibration of existing power transmission towers, incapability of meeting requirements on damping vibration of each existing power transmission tower in two directions and incapability of meeting weight suspension requirements by pendulum lengths of suspenders can be solved. The method in an embodiment of the invention includes determining the mass of double-section rolls of the double-pendulum vibration dampers according to the total mass of the power transmission towers; determining resonance frequencies omega 1 and resonance frequencies omega 2 of the double-pendulum vibration dampers according to inherent frequencies omega 3, in the directions parallel to power transmission lines, of the power transmission towers and inherent frequencies omega 4, in the directions perpendicular to the power transmission lines, of the power transmission towers and acquiring the lengths of the double-section rolls by the aid of the resonance frequencies omega 1 and the resonance frequencies omega 2 by means of iterative solution; determining the diameters of the double-section rolls according to the mass and the lengths of the double-section rolls; designing the corresponding double-pendulum vibration dampers according to the mass, the lengths and the diameters of the double-section rolls and mounting the double-pendulum vibration dampers on cross arms of the power transmission towers.