Weakly mixed land-dominated estuaries are susceptible to the combined influences of fluvial water-sediment fluxes, marine dynamics, and anthropogenic activities, resulting in complex dynamic changes in hydrological connectivity. However, a systematic synthesis of hydrological connectivity in such estuaries is still lacking. Therefore, taking the Yellow River Delta, a representative weakly mixed land-dominated estuary in China, as an example, based on the classification of structural connectivity and functional connectivity, the spatiotemporal patterns, evolutionary trends, and driving factors of hydrological connectivity in tidal flat wetlands were analyzed, and the bidirectional feedback mechanisms between the hydrological connectivity and water-sediment dynamics were emphatically explored. It is pointed out that future research should focus on three directions, including integrating rivers, tidal creeks, and surface-groundwater systems to establish a multi-scale hydrological connectivity framework for entire tidal flat wetlands, enhancing synergistic analysis of field monitoring and numerical models to systematically analyze the feedback mechanisms between hydrological connectivity and water-sediment dynamics in weakly mixed estuaries, exploring nature-based and society-based solutions to improve hydrological connectivity, and establishing synergistic optimization strategies that concurrently enhance hydrological connectivity and restore wetland ecological function, thereby providing practical paradigms for integrated estuary management.