With the development of new energy power generation systems, especially the wide application of photovoltaic power supply systems, the demand for improving the voltage gain of high gain DC/DC converters has increased significantly, among which high gain DC/DC converters based on coupled inductors have become a research hotspot. In this paper, a topology of high gain DC/DC converter with passive clamp coupled inductance is presented. This circuit topology sets up a clamp circuit to absorb the energy released by the leakage inductance of the coupling inductor, while also setting up a circuit for the clamp circuit to recover and utilize the energy released by the leakage inductance. This kind of topology relieves the voltage stress of the switching devices, further improves the output voltage gain, and avoids the saturation problem of clamping capacitance. Finally, through simulation analysis and experimental verification, the results show that the DC/DC circuit topology can achieve higher conversion efficiency, which shows broad application prospects.