Disclosed is an intelligent access authentication system and method. The intelligent access authentication system includes a door lock that can be locked and released in a predetermined manner, a door phone for communicating with the visitor; a smart communicator which configures access approval levels of expected visitors and access authentication information for each access approval level, communicates with the visitor, and controls the door lock, and a home network server which stores the access approval levels of expected visitors and access authentication information for each access approval level received from the smart communicator, checks the access approval level of the visitor attempting to release the door lock by referring to previously stored information, and transmits a door lock operating command to the door lock according to the access approval level of the visitor. In the present invention, the resident can check the visitor and control the door lock to be released according to the access approval level of the visitor, even at a remote location.