Internet of Things (IoT) technology has brought about significant new changes to residents’ lives, prompting changes in management models across various industries and promoting the overall intelligence of urban construction. Especially in the context of continuous technological development, information sensor devices can be effectively utilized to connect multiple dimensions in urban construction, enhancing the intelligence level of cities in China. This paper mainly elaborates on the application significance of IoT technology in smart cities and proposes corresponding measures from aspects such as smart transportation systems, intelligent public utility management, urban safety and monitoring, environmental monitoring, and sustainability, providing references for relevant personnel.