Fuente: Wipo "IOT" The object of the invention is to provide an NB-iot based emergency safety clock, the emergency safety clock comprises: a main control chip; an NB-iot communication module; an emergency help seeking/recording button; a call LED caution light module; a Beidou positioning module; a recording module; a power supply for supplying power to each group of modules; and an emergency safety clock for installing the above components; the object of the invention is to adopt emerging technologies and new ideas, focus on the industry, and intelligently use an emerging Internet of Things dedicated transmission network NB-IOT through the Internet of Things to serve as a data transmission network, the NB-IoT is an emerging technology in the IoT field, supports a cellular data connection of low power consumption devices in a wide area network and is also called a low power consumption wide area network (LPWAN). The NB-IoT supports an efficient connection of devices with long standby times and higher network connection requirements. The service lives of batteries of NB-IoT devices can be prolonged by at least 10 years, and meanwhile very comprehensive indoor cellular data connection coverage can alsobe provided.