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In order to meet the technology development of farmland information collection and intelligent water conservancy detection, and to further optimize the existing intelligent monitoring system of canal water conservancy, a set of remote monitoring system for agricultural irrigation canals based on NB-IoT was designed. The system includes three parts: monitoring node, NB-IoT communication module and remote server. The monitoring node taken the STM32F103RCT6 as the microcontroller to collect farmland information and irrigation channel information at the fixed time point, and sent it to the remote server through the NB-IoT communication module. On the one hand, the remote server parsed the received parameter information, to realize functions such as data display and map positioning. On the other hand, the remote server saved the received parameter information to the TXT file, which is convenient for operations of subsequent data analysis and historical query. The parameter threshold information can be set on the remote server, which can be fed back to the monitoring node to complete early warning judgment and remote alarm. Test results show that the monitoring node collects parameters once at an interval of three hours, the time difference of parameter information reaching the remote server is controlled within eighty milliseconds, and the positioning error displayed on the map is within two meters, which meets the parameter requirements of the system design and provides a strong guarantee for the intelligent monitoring of canal hydraulics.