The invention relates to a clutch mechanism for an energy storing device. The clutch mechanism for the energy storing device comprises a loading gear, a driving gear, a one-way bearing, a bushing and a gear shaft comprising a gear part and a clutch part. The gear shaft comprises a plurality of cylinders and a push rod, a rotary sleeve and an elastic element located in a cavity of the gear shaft. The push rod comprises a push rod sliding hole and a push rod connecting hole respectively used for connecting the gear shaft with the rotary sleeve. A pressing block is fixed on the driving gear, the pressing block pushes the push rod for sliding along the axial direction for unlocking or locking the bushing and the gear shaft. A gas insulated switch adopting the clutch mechanism is further provided. The clutch mechanism and the gas insulated switch can realize the simple and reliable mechanical separation between the power device and the energy storing device with lower cost.