To minimize energy transmission losses of high boost quasi-z source converter in vehicle-mounted lighting system, in the paper a novel high-gain quasi-Z source converter for vehicle-mounted lighting is given. The unique topology of the proposed structure alleviates the current pressure of the coupling inductor and minimizes energy transmission losses. This paper investigates the operating state of the converter and derives the voltage gain. Besides, the voltage and current stresses across the semiconductors have been studied. Finally, a prototype made in the lab examines the effectiveness of this topology.