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In view of the safety problems caused by the large number of existing city manhole covers and poor management of management departments, this paper designs a smart manhole cover monitoring system with NB-IoT low-rate and narrow-bandwidth Internet of Things technology as the core.In this paper, the low-power chip STM32 is used to collect the pressure and displacement of the manhole cover and the methane concentration and water level under the wellbore, and upload it to the server through the NB-IoT module to realize the low-power information exchange between the collection terminal and the server; combined with the intelligent manhole cover management system And mobile APP software design, can intuitively grasp the distribution of the manhole cover and online status.The test results show that the system works stably and the data transmission is reliable, which reduces the labor pressure of managers and maintenance personnel, and prevents the occurrence of safety accidents to a certain extent, realizes the intelligent management of urban manhole covers, and provides the technical foundation for smart municipality and big data analysis.