Roadblock warning device for highway construction

The roadblock warning device for the highway construction comprises a supporting box, two telescopic rods are fixedly installed on one side of the inner wall of the supporting box, a supporting plate is fixedly installed at the ends, away from the supporting box, of the two telescopic rods, two fixing rods are fixedly installed at the top of the supporting plate, and the two fixing rods penetrate through and extend out of the supporting box. According to the roadblock warning device for highway construction, the supporting box is moved to a place where warning is needed, meanwhile, the storage battery supplies power to the lamp belt, the lamp belt emits light to achieve the warning effect, and the roadblock warning device has the advantages that the supporting box is moved to the place where warning is needed; when the height of the warning plate needs to be adjusted, a motor is started to drive a rotating rod to rotate, a cam does circular motion to eject the supporting plate upwards, the supporting plate mo