A digital power supply device is provided. The digital power supply device comprises a digital power supply controller, a switch and a control module. The digital power supply controller includes a first digital power supply module configured to generate and provide a first electric energy to a first load via a first path; and a second digital power supply module configured to generate a second electric energy. The switch is electrically connected to the second digital power supply module. The control module is configured to send a control command to the switch to control the switch electrically connected to the first path or a second path. An operation method of a digital power supply device is also provided.