The 7075 aluminum alloy, belongs to the Al-Zn-Mg-Cu series of ultra-high strength aluminum alloy, finds extensive application in aerospace structural component manufacturing. However, the wide solidification range of this alloy poses challenges when utilizing selective laser melting (SLM) technology for printing and forming, as it often leads to crack defects that severely compromise the load-bearing performance of the components. This study focuses on addressing the cracking issue encountered during the SLM printing process of the 7075 aluminum alloy. To mitigate this problem, the original 7075 aluminum alloy powder undergoes a microalloying treatment using ball milling and powder mixing techniques involving Ti and Zr composite addition. By incorporating 0.7% (by mass fraction) Zr and 0.5% (by mass fraction) Ti, all internal cracks and defects within the alloy are effectively eliminated. Additionally, the microstructure characteristics undergo a transformation from coarse columnar grains to an alternating distribution of coarse and fine grains, resulting in a significantly refined grain size. The introduction of Ti and Zr elements facilitates the formation of a coherent Al3(Ti, Zr) phase with the alloy matrix. This not only promotes grain size refinement but also enhances precipitation strengthening, thereby substantially improving the mechanical properties of the printed alloy. As a result, the tensile strength and elongation at break reach (413±8) MPa and 23%, respectively.