The invention provides a triangle warning sign and belongs to the technical field of military warning equipment. The implement method of the warning sigh comprises the steps that sparkling neon lights are disposed in the warning sign; a transportation record number is disposed on the bottom of the sparking neon lights; a sound emission button is on the right of the sparkling neon lights; a solar panel is on the left of the sparkling lights. A sound emission antenna is disposed on a steeple of the warning sign. A triangle bracket is disposed on a reverse side of the warning sign body and the triangle bracket overlaps with the launch and recovery of configuration of the warning sign body. A sound emitter is disposed on the right of the inside of the warning sign body and is connected with the sound emission antenna and is corresponding to the sound emission button. A satellite positioning chip is disposed on the upper portion of the inside of the warning sign body. A solar power reservoir is on the right of the inside of the warning sign body and is connected with the solar panel. The configuration of the warning sign body is composed of a duotone and reflective triangle frame. The warning sign has the advantage that drivers of the back vehicles can quickly take measures of stopping and lane-changes for reducing accident occurrence of tailgate by utilizing a voice notice method of using reflecting materials of sparkling neon lights with strong ability of penetrating fog.