Unmanned aerial vehicle searching method under network-free condition

The invention relates to an unmanned aerial vehicle searching method under the condition of no network, and the method comprises the following steps: when a first unmanned aerial vehicle flies normally, a communication module transmits coordinate information collected by a GNSS module to the rear end of a server, and stores a GNSS coordinate point; after an air crash accident occurs, acquiring a current network state and GNSS coordinate information; in the network state, if the GNSS coordinate information is lost, the UWB module is started and set, and a user is waited for control; otherwise, reporting the GNSS coordinate information of the crash point through the network and waiting for a user instruction; in a network-free state, the first unmanned aerial vehicle automatically opens a UWB module for searching, uses a second unmanned aerial vehicle and installs a base station until a position near a final GNSS coordinate point is obtained, and when the first unmanned aerial vehicle is in communication connec