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In order to solve the problems of poor mobility, low degree of informatization and inconvenient management of air quality monitoring in the existing variable area, a regional air quality monitoring system based on NB-IoT is designed and implemented. The system is composed of multiple monitoring nodes, remote monitoring platform and Android mobile terminal. The monitoring node uses STM32 as the microcontroller to collect the air quality parameters of its location and send them to the remote monitoring platform through the NB-IoT communication module to realize the monitoring and management of air quality in large areas. By issuing the authority of the designated small area to the Android mobile terminal, then the terminal can check the air quality status within the scope of authority. The system test shows that the measurement accuracy is high, the data transmission is stable and reliable, and it meets the needs of flexible application in multi-scene environment.