Abstract: A vehicle warning device includes a lamp holder and a charging base. There are many LEDs at one side of the lamp holder and is a retaining member at the other side. The lamp holder comprises a power switch being outside the lamp holder and electrically connected to the LEDs; a power supply unit being in the lamp holder and electrically connected to the power switch; and a first electric connection unit being in the lamp holder and electrically connected to the power supply unit. The charging base has a charging unit electrically connected to the second electric connection unit, and a second electric connection unit electrically connected to the first electric connection unit. The lamp holder emits light by itself, warning other vehicle drivers or pedestrians. The lamp holder is at a random site outside a vehicle, thereby being featured with high security and high convenience.