Abstract: The disclosure provides an engineering communication transfer device and system. The device includes a communication transfer box. The communication transfer box includes a communication input terminal, a first communication output terminal, and a second communication output terminal; the communication input terminal is connected to a communication cable, and the communication cable is connected to a safety monitoring instrument; the first communication output terminal is connected to an information acquisition instrument, and the second communication output terminal is connected to a cable of an external access device; the communication transfer box is configured to connect the communication cable to the second communication output terminal when an external access device is connected to the second communication output terminal. The disclosure achieves beneficial effects of being simple, convenient and efficient in intermediate measurement and reading, without damaging a transmission line.