Method of drawing pilot rope by unmanned aerial vehicle for river-crossing construction

The present invention provides a method of drawing a pilot rope by an unmanned aerial vehicle for river-crossing construction. The method comprises the steps that: one worker arranges a pilot rope winding disc and an unmanned aerial vehicle on tower top of one end of a bridge at the initial point; the worker draws the pilot rope from the pilot rope winding disc to be connected with the unmanned aerial vehicle, and simultaneously binds a balancing weight on the pilot rope; the unmanned aerial vehicle draws the pilot rope and flies to tower top of the other end of the bridge; and another worker pulls and receives the pilot rope on the tower top, the unmanned aerial vehicle relieves connection with the pilot rope, and the worker manually anchors the pilot rope on an anchoring portion of the tower top. According to the method, the complete dynamic flight mode is designed and developed, construction period is short, cost is low, navigation and traffic are not closed really, limitation by topography, hydrology and traffic is prevented, and construction risk is also reduced, thereby facilitating popularization and application.