Smart city display system is to light pole LED screen as a carrier, combined with LED ultra-high-definition display technology, WiFi and Internet technology, power carrier IoT technology, sensing technology, a practice of smart city construction. High-definition small spacing LED display in the field of intelligent display unique, functional clusters in one: 4G intelligent management core module, monitoring, face recognition, brightness automatic adjustment, temperature control heat dissipation, picture video and text timely insertion, multi-language, GPS accurate positioning, synchronous playback, asynchronous playback, air PM2.5, temperature, humidity monitoring, remote switch screen power, real-time monitoring of the screen body internal Temperature, humidity, terminal online monitoring and management functions, to achieve remote restart, pause, upgrade, file deletion and so on.