The invention provides a method for manufacturing a solid aluminum alloy structure through a wire filling type additive, and belongs to the field of additive manufacturing. The method aims to solve the problems in the existing aluminum alloy laser filler wire additive manufacturing and electric arc additive manufacturing that the reflectivity of the aluminum alloy to the laser is high, the formingquality is poor caused by unstable electric arc, and the structure of a forming part is large caused by large heat input and the like. A laser-TIG composite heat source is adopted, and the laser andthe electric arc interact, so that on one hand, the heat input can be reduced, the structure of the forming part is refined, and the strength is improved; and on the other hand, the laser can stabilize the electric arc, so that the electric arc is more stable in the multi-layer multi-channel forming process, and the lap joint effect is optimized. According to the method, arc currents and inter-layer arc currents between adjacent welding beads are adjusted, so that the heat input in the continuous forming process is reduced, the appearance size of the obtained forming part is stable, crystal grains are refined, and the forming efficiency is remarkably improved compared with the control interlayer temperature and the interlayer residence time.