The invention discloses an intelligent assembly, which is externally connected with a host computer and electric equipment and comprises a main IED (intelligent electronic device) and a plurality of sub IEDs connected with the main IED, wherein each IED comprises a sensor, a signal preprocessing circuit, a single chip microcomputer, a power supply module and a memory, the sensors, the signal preprocessing circuits, the single chip microcomputers and the memories are sequentially connected, the power supply modules are respectively connected with the signal preprocessing circuits and the single chip microcomputers, the single chip microcomputers are connected with the main IED, the main IED is connected with the host computer, and each digital signal from each sub IED is received for carrying out primary processing, and in addition, the processed digital signals are transmitted to the host computer. The intelligent assembly has the advantages that all sub IEDs are mutually independent, the problem that all intelligent assembly functions are influenced by the failure of one sub IED can be avoided, users can conveniently select the proper integration scheme from different IED suppliers according to requirements, and better maintainability is realized.