The high boost DC-DC converter is an important part of a grid-connected fuel cell. A current-fed boost converter with switched capacitor focusing on low output voltage and soft output characteristics is proposed. First, the proposed converter topology and its working principle in continuous/discontinuous conduction mode are described in detail. Then, the voltage gain and the voltage/current stress of each component are analyzed concretely. The performance is compared with SC-Boost, SL-Boost and other converters. Finally, a 200 W experimental prototype is built to verify the proposed converter’s feasibility and the correctness of the theoretical analysis. The proposed converter combines the current-fed structure and the switched capacitor network. It has the advantages of high voltage gain, continuous input current and low ripple. These properties are beneficial in prolonging the service life of the fuel cell. The voltage of the switch is clamped by multiplexing the capacitor-diode (C-D) unit in the switched capacitor. This reduces the voltage stress of the power component. Therefore, the proposed converter is suitable for grid-connected fuel cell systems.