Hydrological monitoring system based on unmanned aerial vehicle

The invention relates to a hydrological monitoring system based on an unmanned aerial vehicle. The hydrological monitoring system comprises the unmanned aerial vehicle, a server, a sensor assembly used for hydrological monitoring, a winch used for winding and lifting the sensor assembly, a data transmission module, a video monitoring module and a positioning module, and a vibration type balance weight is installed at the sensor assembly. The sensor assembly is conveyed to a to-be-detected area through the unmanned aerial vehicle, hydrological data such as dissolved oxygen, pH, residual chlorine, TOC, conductivity, chlorophyll, ammonia nitrogen, liquid level, turbidity, total phosphorus, temperature, water body images or videos and the like of the to-be-detected area are monitored through the sensor assembly, and the monitored data are transmitted to the server through the data transmission module. And the server classifies, arranges and numbers all the obtained data, carries out tagging processing, and carrie