The utility model discloses an emergent communication device of cable tunnel, including installing the networking system in cable tunnel, networking system includes radio site and AP node, and every certain distance is provided with the radio site in cable tunnel, radio communication carries out between radio site and the AP node, radio communication carries out between AP node and the intelligent terminal, the AP node is communicated through wire mode and the outer wireless router of cable tunnel, wireless router communicates with the host computer through wireless mode again. The utility model provides a consumer power supply problem in the pit. Equipment adopts high -power industrial grade equipment, ensures coverage area promptly, has good stability and environmental suitability again, ensures whole maintenance process communication and can incessantly go on.