Manhole cover detectors for urban roads, built-in gyroscopes to detect manhole cover rollover and other faults, and through the NB network reporting platform, the deployment of the "urban manhole cover" intelligent real-time monitoring IoT system can be quickly implemented without wiring, greatly reducing the construction time of the real-time monitoring system And reduce the implementation cost of the system. Realize the functions of monitoring the state of the manhole cover (opening, displacement, and tilt), real-time alarm, automatic inspection, and timely disposal to ensure safe operation, further improve the level of informationization and intelligence of municipal management, and lay the industry application foundation for smart cities.