Abstract: The disclosure provides a power management method and a power management device. The method includes: reading a specific memory which includes a plurality of error data records; selecting a specific data record based on a usage status indicator of each error data record; sequentially sending an enable signal to each hardware device; in response to determining that an enable successful response corresponding to the enable signal is not received from a specific hardware device, or a boot alarm is received, at least obtaining a low pin count value and a power management status; recording the low pin count value and the power management status in the specific data record, and accordingly updating the usage status indicator of the specific data record.