The utility model provides an intelligent nuclear phase instrument includes control module, nuclear phase module, calling module, the power modul, nuclear phase module includes nuclear phase module ofmain website and sub -station nuclear phase module, the nuclear phase module of main website is connected with threephase cable head end and shielded wire head end, sub -station nuclear phase moduleand threephase cable tail end and shielded wire trailing end connection, calling module includes the intercommunication device of main website, the circuit jointing equipment of main website, sub -station intercommunication device, sub -station circuit jointing equipment, the circuit jointing equipment of main website is connected with the threephase cable head end, sub -station circuit jointing equipment and threephase cable trailing end connection, the intercommunication device of main website establishes ties between circuit jointing equipment of main website and shielded wire head end, sub-station circuit jointing equipment establishes ties between sub -station circuit jointing equipment and shielded wire tail end, control module realizes the switching work between nuclear phase module and the calling module according to the external control instruction, the utility model discloses a nuclear phase adopts the multiplexing mode of timesharing with the conversation, realizes throughthe single chip microcomputer control relay.