As the number of Alzheimer's disease (AD) patients rises, causing significant suffering and socioeconomic burden, extensive research has been dedicated to understanding its elusive pathogenesis, focusing on amyloid cascade, tau protein, neuroinflammation, metal ions, and oxidative stress, with oxidative stress serving as a central factor that bridges these mechanisms; this review comprehensively expands on the roles of oxidative stress in AD, providing clear figures to enhance understanding.