The invention provides an agricultural natural disaster monitoring system based on a pole tower power supply and relates to the technical field of agricultural natural disaster monitoring. The systemcomprises a power taking device arranged on a pole tower, a natural disaster monitoring device and a wireless transmission device, wherein the natural disaster monitoring device and the wireless transmission device are electrically connected to the power taking device, and an output end of the natural disaster monitoring device is connected to the wireless transmission device. The monitoring system also comprises a terminal server connected to an output end of the wireless transmission device. The monitoring system provides power for the monitoring system based on the sharing of the pole tower. The natural disaster monitoring device initially processes monitored real-time dynamic data through the wireless transmission device and then transmits the data to the terminal server, the terminalserver performs further analysis and processing to guide agricultural production activities and generates big data at the same time, and the big data is stored in a database. According to the monitoring system, problems such as scattered monitoring points, small coverage, large consumption time and limited transmission mode can be solved.