The invention provides a hot-line work safety alarm system. The objective of the invention is to solve problems in the prior art and improve the safety of the hot-line work of workers. The hot-line work safety alarm system includes a human-computer interaction and control platform, a safety helmet embedded ultrasonic generation device, a watch type ultrasonic generation device, an ultrasonic receiving and alarm device and a GPS clock system. With the hot-line work safety alarm system of the invention adopted, when a distance from the hands or head of a worker to an electrified device is smaller than a safe distance, the system gives an alarm and prompts the worker, so that the safety of the hot-line work can be improved; since the safe distances of different electrified devices are different, the ultrasonic receiving and alarm device is installed on a certain electrified device, and the safe distance of the ultrasonic receiving and alarm device can be set as the safe distance of a corresponding electrified device, and therefore, the hot-line work safety alarm system is adaptive to different electrified devices.