The invention discloses a single-switch high-gain boosting DC (direct current) / DC converter, comprising a DC input power supply, a first inductor, a first diode, a second diode, a second inductor, a first capacitor, a switch tube, a third diode, a second capacitor, a third inductor, a third capacitor, a fourth diode and an output capacitor; the DC input power supply is connected with the first inductor, the first capacitor, the switch tube, the third capacitor, the output capacitor and a load respectively; the first inductor is respectively connected with the first diode and the second diode; the second inductor is respectively connected with the first diode, the switch tube, the third diode, the second capacitor, the second diode and the first capacitor; the second capacitor is connected with the third inductor and the fourth diode respectively; the third diode is respectively connected with the third inductor and the third capacitor; the fourth diode is respectively connected with the output capacitor and the load. Compared with the prior art, the single-switch high-gain boosting DC (direct current) / DC converter has the advantage of higher stable voltage gain, and is suitable for raising lower voltage to the higher voltage in a new-energy power generation system.