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The residual stress, generated during the additive manufacturing of aluminum alloy components, has become a critical factor influencing their performance. A comprehensive understanding of the underlying mechanisms responsible for forming residual stress and developing effective prediction and control strategies are essential for enhancing the structural performance of aluminum alloy parts. This paper systematically reviews the latest research advancements in residual stress in the additive manufacturing of aluminum alloys. Firstly, the influence of residual stress on the properties of aluminum alloy components is discussed, including their impact on defects, microstructures, and mechanical properties. Secondly, the mechanisms of residual stress generation are analyzed, involving complex thermal stress fields and microstructure evolution. Various factors affecting the residual stress, primarily related to component design and manufacturing processes, are also analyzed. Furthermore, the application of advanced detection techniques, such as X-ray diffraction and neutron diffraction, is described. The significant effects of accurate model-based prediction methods and modulation strategies, such as surface treatment, on improving component residual stress are also reviewed. Finally, the paper concludes with a summary and prospects on the future trends and directions in the study of residual stress in the additive manufacturing of aluminum alloys.