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In view of the problems of anti-theft, key management and working environment monitoring in the management of optical cable exchange box, a NB-IOT based monitoring system is introduced in this paper. The system consists of monitoring terminal, cloud platform profile, plug-in and monitoring server software. Low power controller is used to complete the electronic lock control and the detection of temperature and humidity, smoke, water intrusion, power supply voltage, vibration and tilt. Combined with NB-IOT network, bluetooth function and server software, the management of electronic lock digital key, daily monitoring information and alarm information is realized. The test results show the success rate of network connection, data acquisition, transmission and control of the system is more than 98%, which can effectively improve the security of the optical cable exchange box, and realize intelligent management.