Expressway safety warning alarm

The utility model publicizes a highway safety caution and alarm device used for highway safety control, aimed to prevent and control happenings of grave traffic accidents and prevent accidents of concatenate rear collision on highway or high standard highway. The utility model comprises a plurality of live-line cables laid down along the highway, a plurality of caution lights connected with the cables as well as a plurality of power switches connected with the caution lights; the utility model is characterized in that: the highway is divided into a plurality of sections and each section is a caution section, caution power lines, a plurality of caution lights and power switches are positioned within each caution section; the caution lights and the caution power lines are connected with live-line cables through the power switches.