The invention discloses a device, a method and a system for realizing address order identification of an embedded device. In the system, all devices are connected through field buses, and are connected in series in turn through interface units arranged on the devices to form an address control signal transmission line for transmitting a slave strobe signal; moreover, every two devices are in cascade connection through a controllable connection unit, and the control end of each controllable connection unit is correspondingly connected with the output end of a delayed control signal of one device; and each controllable connection unit is used to keep or cut off the connection of a device and the address control signal transmission line according to the delayed control signal output by the device connected with the unit. The device, the method and the system solve the problems of bus conflict or identification error, and the like caused by the address loss of the device, realize automatic order identification and allocation of the address during putting the device into service, and are suitable for a network in which no communication is carried out among slave devices.