The invention relates to the technical field of building decoration, in particular to an anti-aging method for building exterior walls. The method uses a building curtain wall, and the building curtain wall comprises a first supporting mechanism, second supporting mechanisms, curtain wall fixing mechanisms, a third supporting mechanism, locking mechanisms and adjusting mechanisms. According to themethod, connection with a floor is conducted in advance through connecting mechanisms, the mounting positions of the supporting mechanisms are positioned, when a top supporting bracket is fixed, mounting pipes and the connecting mechanisms are simply clamped together, and there is no need for workers to lift the top supporting bracket for installation; the curtain wall fixing mechanisms are in clamped connection with side supporting brackets, and installation is simply conducted column by column from bottom to top in the installation process, so that the installation process of an overall curtain wall system is more simple, the curtain wall and the side supporting brackets are closely matched with each other, and the structural strength is high; when the curtain wall needs to be disassembled, adjusting gears can be rotated, so that locking blocks are stored in sliding strips, and the curtain wall and the side supporting brackets can be separated.