A vehicle light control method and device are provided for controlling a light unit of a vehicle. A control unit determines whether a vehicle speed of the vehicle detected by a vehicle speed detector is greater than zero and whether an engine rotational speed of an engine of the vehicle detected by an engine rotational speed detector is equal to zero. The control unit enables the light unit to emit light with a brightness based on the vehicle speed upon determining that the vehicle speed is greater than zero and the engine rotational speed is zero.