The application discloses a dual-
power switching circuit and a dual-
power switching method. The circuit comprises a hardware switching circuit, a
software switching circuit, a
backup power supply circuit, a secondary power supply circuit and a competition
control circuit. The competition
control circuit comprises a first competition control module, a second competition control module and an inverting module. The
backup power supply circuit and the secondary power supply circuit comprise a power
failure prevention module for providing a power
failure prevention voltage during a conduction switching process. The hardware switching circuit is connected with the first competition control module and is used for inputting a hardware
control signal to the first competition control module. The
software switching circuit is connected with the second competition control module and is used for inputting a
software control signal to the second competition control module. The first competition control module and the second competition control module are connected with the
backup power supply circuit and the inverting module. The inverting module is connected with the secondary power supply circuit. The competition
control circuit is used for controlling the conduction switching of the backup power supply circuit and the secondary power supply circuit according to the hardware
control signal and the software control
signal.