Forest fire early warning device based on Beidou positioning and using method thereof

The invention discloses a forest fire early warning device based on Beidou positioning and a using method thereof. The device comprises forest fire prevention early warning devices and trunks, whereinthe three forest fire prevention early warning devices form a complete forest fire prevention early warning unit. The three forest fire prevention early warning devices are annularly arranged aroundthe trunk through steel wire ropes; the rear side panel body of the forest fire prevention early warning device can be automatically propped against and matched with the surfaces of trunks with different diameters and radians through automatic propping elastic extension and retraction of the multiple groups of trunk propping contact assemblies; meanwhile, the trunk propping contact assembly has acertain elastic buffer function; when the forest fire prevention early warning device encounters an external impact force, the forest fire prevention early warning device stretches out and draws back,impact force on the forest