The invention relates to a novel ageing and electrical brush-plating compounded treatment method for Al-Zn-Mg-Cu series aluminum alloy weld. The novel ageing and electrical brush-plating compounded treatment method for Al-Zn-Mg-Cu series aluminum alloy weld comprises the following step: carrying out duplex ageing treatment and electrical brush-plating treatment after carrying out butt welding on aluminum alloy plates by laser. Compared with the traditional weld heat treatment process including welding, slag removal, solution treatment, quenching and ageing, the novel ageing and electrical brush-plating compounded treatment method for Al-Zn-Mg-Cu series aluminum alloy weld has the advantages that on one hand, by the method, properties such as the strength and the hardness of the weld can beimproved, the combination properties of the weld are greatly improved, and the service life of a welded part is prolonged; and on the other hand, by the method, a layer of other metal can be arrangedon the surface of the welded part by electrical brush-plating according to different requirements including improvement of anti-SCC property, improvement of conductivity, improvement of oxidation resistance, improvement of wear resistance, improvement of reflecting property and the like on the surface of the welded part, meanwhile, the surface roughness of the welded part is reduced, and the attractiveness of the weld is ensured. In addition, compared with the traditional electroplating, the electrical brush-plating has the characteristics of flexibility in operation and resource conservation. Finally, by the method, the ornamental value of the welded part can be greatly increased, and sales are also increased; and the method has extensive application potential in the fields such as the automobile industry, aviation and aerospace and the decoration industry.