The invention provides a triangular red dynamic warning lamp for an automobile fault, and the warning lamp is characterized in that the warning lamp comprises a 12V lithium battery, an ultralow frequency oscillator, a level photoelectric conversion and bidirectional silicon controlled rectifier triggering circuit, and a light-emitting diode drive circuit. Most of common triangular red warning signs are just provided with red reflecting films, and just can reflect light passively, so the brightness of the reflected light is very limited, and the warning effect will be greatly reduced when the light of a vehicle lamp is poor at night, the sun is setting in the west, or a day is rainy. If constant red light is employed for manufacturing a triangular warning lamp, the warning effect is still not good. Therefore, three sides of the triangle of the warning lamp provided by the invention are respectively provided with flashing superhigh shiny red light-emitting diodes. At night, the flashing superhigh shiny red light-emitting diodes emit eye-catching flashing red light, and can achieve a better warning effect than unchanged red light, thereby achieving ideal warning effect during daytime or nighttime.