An automobile auxiliary lamp includes a lamp and a connector. The connector is installed at a proper location of an automobile and connected with the terminals of related control devices of the automobile for receiving electricity supplied by the automobile, and the lamp is engaged with the connector. When a user operates a related control device of the automobile, the lamp will synchronously be triggered through a control connecting line to function and emit light, able to enhance warning effect of the automobile lamp. In addition, the auxiliary lamp can also be removed from the automobile to be independently used as a common illuminating lamp, enabling a user to use the lamp for various purposes.