Abstract: The DC-DC converters with high gain and high efficiency are the most critical link in the DC microgrid system. This paper proposes a DC-DC converter based on quasi-Z-source, which combines a three-winding coupled inductor and a voltage multiplier cell（VMC）. The converter not only inherits the advantages of quasi-Z-source structure, coupled inductor, switched capacitor/inductor, but also has the advantages of high voltage gain, continuous input current, circuit clamping, low voltage/current stress of components, small current ripple, etc. Moreover, it reduces the circuit loss and gets high work efficiency through the realization of soft switching of active components. This paper describes the working principle, characteristics, steady state and parameter selection of the proposed converter. Finally, a 200 W experimental prototype is built in the laboratory to verify the feasibility of the proposed converter.