The utility model relates to a dispatching data network chain break autoalarm, including setting up signal receiving unit, the fault -signal unit of setting on dispatching data network equipment in the main website, the fault -signal unit include signal acquisition element, signal converting unit and signalling unit, does fault -signal pass through GSM, TD SCDMA, WCDMA, CDMA2000, TDD LTE or FDD LTE wireless communication network transmission is to for main website of dispatching automation system to set up at the both ends of aforementioned wireless communication network and encrypt and the authenticate device, signal acquisition element including set up the auxiliary contact that installs additional on dispatching data network main power source and stand -by power supply, when dispatching data network broke down, the signal acquisition circuit's that links to each other with auxiliary contact voltage or electric current were freeed and are changed and production fault -signal. Compared with the prior art, the utility model discloses the small investment, the operation cost is low, strives for the time that more has more for the processing of trouble.