Smart waterway, as an important part of smart cities and public transport systems, have a profound impact on the construction of some coastal cities. This paper reviews the current research status of Smart waterway, including its definition, development history and system architecture. Through the construction of perception layer, network transmission layer, data layer and application layer, it reveals the key technologies of Smart waterway in realizing the smartness of water transport. The development status and achievements of each technology layer and its role in the synergistic development of Smart waterway with Smart cities and public transport are introduced in depth. Finally, the concept of waterway hierarchy is proposed, highlighting its importance in future research and looking forward to the development of Smart waterway, which provides a new perspective for the optimization of the transport system in coastal cities.