Line external damage prevention warning device and method

The invention discloses a line external damage prevention warning device and method, wherein the device comprises a warning ball main body and a control mainboard, the upper part of the warning ball main body is provided with a connecting device, and the connecting device comprises a connecting part which is connected with an external facility and a lifting part which is used for lifting the warning ball main body. A projection device and a camera device used for capturing an invader are arranged on the lower portion of the warning ball main body, and the projection device comprises a projector and a laser scribing device used for displaying the safety range and a device warning method. Through a rotary drum and a lifting rope between the connecting part and the lifting part, the warning ball main body can descend to the ground or descend by a certain height to be away from a cable through external remote control during maintenance or replacement, the maintenance and replacement difficulty is reduced, meanwhi