A device management system for managing at least one device hot-swappable within a rack cabinet, the device management system comprising: a bus bar for transferring signals and DC power (Vdc); a device management module for monitoring whether the device is installed in the rack cabinet and collecting information of the device which is installed in the rack cabinet, wherein the device management module comprises: at least one remotely-controllable switching circuit installed in an installation block, wherein a first end of the remotely-controllable switching circuit is connected with the bus bar, and a second end of the remotely-controllable switching circuit is connected with the device which is installed in the rack cabinet, wherein during operation of the remotely-controllable switching circuit, the information of the device is collected by the remotely-controllable switching circuit in real time; and a detecting circuit connected with the bus bar and in communication with the remotely-controllable switching circuit for detecting whether the device is installed in the rack cabinet, wherein a location table about a location of the remotely-controllable switching circuit in the installation block is previously stored in the detecting circuit, wherein when the device is installed in the rack cabinet, the remotely-controllable switching circuit connected with the device is enabled by the detecting circuit according to the location table; and a remote management module in communication with the remotely-controllable switching circuit and the detecting circuit through the bus bar, wherein the information of the device is acquired by the remote management module through the remotely-controllable switching circuit, wherein a switch element of the remotely-controllable switching circuit which is connected to the device is selectively turned on or turned off by the remote management module, wherein when the switch element is turned on, the DC power (Vdc) is transmitted to the device through the switch element. a bus bar for transferring signals and DC power (Vdc); a device management module for monitoring whether the device is installed in the rack cabinet and collecting information of the device which is installed in the rack cabinet, wherein the device management module comprises: at least one remotely-controllable switching circuit installed in an installation block, wherein a first end of the remotely-controllable switching circuit is connected with the bus bar, and a second end of the remotely-controllable switching circuit is connected with the device which is installed in the rack cabinet, wherein during operation of the remotely-controllable switching circuit, the information of the device is collected by the remotely-controllable switching circuit in real time; and a detecting circuit connected with the bus bar and in communication with the remotely-controllable switching circuit for detecting whether the device is installed in the rack cabinet, wherein a location table about a location of the remotely-controllable switching circuit in the installation block is previously stored in the detecting circuit, wherein when the device is installed in the rack cabinet, the remotely-controllable switching circuit connected with the device is enabled by the detecting circuit according to the location table; and at least one remotely-controllable switching circuit installed in an installation block, wherein a first end of the remotely-controllable switching circuit is connected with the bus bar, and a second end of the remotely-controllable switching circuit is connected with the device which is installed in the rack cabinet, wherein during operation of the remotely-controllable switching circuit, the information of the device is collected by the remotely-controllable switching circuit in real time; and a detecting circuit connected with the bus bar and in communication with the remotely-controllable switching circuit for detecting whether the device is installed in the rack cabinet, wherein a location table about a location of the remotely-controllable switching circuit in the installation block is previously stored in the detecting circuit, wherein when the device is installed in the rack cabinet, the remotely-controllable switching circuit connected with the device is enabled by the detecting circuit according to the location table; and a remote management module in communication with the remotely-controllable switching circuit and the detecting circuit through the bus bar, wherein the information of the device is acquired by the remote management module through the remotely-controllable switching circuit, wherein a switch element of the remotely-controllable switching circuit which is connected to the device is selectively turned on or turned off by the remote management module, wherein when the switch element is turned on, the DC power (Vdc) is transmitted to the device through the switch element.