Automotive warning sign with lifting function

An automotive warning sign with a lifting function comprises an upper supporting leg, a lower supporting leg, a supporting rod, telescopic rods and a triangular warning sign. A recess is formed in the middle of the upper supporting leg, and middles of the upper supporting leg and the lower supporting leg are hinged through a hinge shaft. A guide member is fixedly arranged above the left half portion of the upper supporting leg and is provided with a cross guide slot. The supporting rod is capable of moving left and right along the cross guide slot through a tightness regulating bolt at the lower end of the supporting rod. At least one telescopic rod is arranged at the upper end of the supporting rod, and a lower tightness regulating bolt is arranged on the side wall of the supporting rod and at the lower end of the telescopic rod. The upper end of the telescopic rod is provided with a clamp slot for clamping the triangular warning sign, one side wall of the clamp slot is in threaded connection with an upper t