Abstract: Unmanned aerial vehicle（UAV），as a new agricultural machinery，has played an important role in China′s agricultural development and it promoted the process of modernization of China′s agriculture. Application on agriculture and advantages of UAV were analyzed. Application of UAV in modern water saving technology to soil moisture comprehensive real time precision monitoring was expounded. Development trend of UAV in future water saving agriculture was discussed. It provided theoretical basis for the development of precision technology of water saving in China. And it laid foundation for further improvement and development of agricultural UAV.