According to the automatic optical disk ferry system and method between an internal network and an external network. A photoelectric sensor, a mechanical arm, a CD writer and a tray are adopted, and an automatic mechanical arm is adopted for CD recording, transferring and data import and export, meanwhile, seamless joint with a service system is achieved, information leakage is effectively prevented, manpower is liberated, and the working efficiency of information ferry is improved; Two photoelectric sensors are installed at the same position of the same CD writer. the pop-up state of the CD-ROM of the CD-ROM can be sensed at the same time. The intranet server, the extranet server and the manipulator controller can sense the pop-up state of the CD-ROM of the corresponding CD-ROM in real time without any information flow intersection, so that physical isolation of intranet data, extranet data and manipulator control data in the transmission process is ensured, and full automation of therecording, transferring and reading processes of the CD-ROM is realized.