The invention discloses a high-strength anti-cracking aluminum alloy welding wire for a welded joint. The high-strength anti-cracking aluminum alloy welding wire comprises, by mass, Mg, B, Li, Cu, Si, Ti, Cr, Mn, Fe, V, Sr, Na, Zr, Nb, Mo, Pr, Ce, Nd, and the balance Al and inevitable impurities. The high-strength anti-cracking aluminum alloy welding wire for the welded joint, provided by the invention, is reasonable in component, little in splash in the welding process, compact in deposited metal structure and free of pores and cracks. The welded joint has the advantages of high strength, good anti-cracking property, large base metal bonding strength and the like. The overall performance of a metal component is improved.