The invention discloses a power switching device for assisting in natural-energy power supply. An AC supply side is connected with a power supplier; the power supplier is communicated with a transfer switch; the transfer switch is communicated with a charge-discharge controller and a load; the charge-discharge controller is communicated with a natural-energy power supplier and a voltage sensor atleast; and the voltage sensor is communicated with a storage battery at least. When the storage battery has stored electric energy, the voltage sensor can control the transfer switch to transfer the load to be communicated with the charge-discharge controller, and the electric energy of the storage battery can be supplied to the load via the charge-discharge controller and the transfer switch. When the electric energy of the storage battery is depleted, the voltage sensor can control the transfer switch to transfer the load to be communicated with the power supplier; the power supplier can convert and supply the electric energy of the AC supply side to the load via the transfer switch; and the AC supply side is used as a standby load. During a period when a natural-energy power supply device stops supplying power, the power switching device can continuously supply power to drive the load to operate and then promote the use reliability of the natural-energy power supply device.