The utility model discloses an early warning safety belt for iron tower high altitude construction, including box body, alarm device, trigger device, the box body sets up on the safety belt, alarm device sets up in the box body, alarm device includes warning circuit, trigger device sets up on the safety belt, and with alarm device ferroelectric phase even, when trigger device contacts with the iron tower warning circuit is out of work, when trigger device does not contact with the iron tower warning circuit work. The utility model provides a pair of an early warning safety belt for iron towerhigh altitude construction can will get in touch that tak eoff away and the situation of no longer hanging on the iron tower is reported to the police from the iron tower to the staff at the high altitude construction in -process to can guarantee effectively that operator person from start to finish hangs the suspender on the iron tower when high altitude construction.