Abstract: A system, method, device, and storage medium for managing device power consumption related to the field of Ethernet power supply. The system for includes a power supply mode monitoring module to monitor a power supply mode of power sourcing equipment in real time; a PoE power-saving strategy configuration module to display available power consumption and real-time power consumption data of a powered device and receiving an adjustment operation instruction; and a PoE power consumption estimation module configured to acquire a power consumption limit of the powered device, and estimate the real-time power consumption data and the available power consumption according to an adjustment target corresponding to the adjustment operation instruction provided from the PoE power-saving strategy configuration module, so as to adjust device functions of the powered device.