In recent years, researchers have significantly increased their exploration of nanomaterials, primarily due to their exceptional and distinctive electrochemical properties. Hierarchical nanostructured materials have become a prevalent component in electrochemical sensors owing to their numerous advantages, including abundant open diffusion channels, diverse junction interfaces, and a highly exposed surface area. This review provides a comprehensive overview of the potential of hierarchical nanomaterials as electrode modifiers, highlighting their capacity to enhance device performance. The introduction section sets the context by addressing the challenges and recent advancements in the field of hierarchical nanomaterials, emphasizing their promise for electrochemical sensor applications, and outlining the diverse research directions that are currently being explored. In the following section, a range of strategies and techniques for synthesizing hierarchical nanomaterials are outlined, with an emphasis on the impact of various parameters on their properties. Subsequently, the characteristics and performance of diverse hierarchical nanomaterials as electrode modifiers for electrochemical sensor applications are examined. Ultimately, the primary aspects and challenges of hierarchical nanomaterials in the domain of electroanalysis are reported, followed by a discussion of their future development.