The invention relates to a 7 * 24 safety guard, which is a household safety emergency controller, is mainly used for household safety emergency alarm, and can realize the monitoring and early warning of hidden dangers such as fire, air quality, gas safety and the like. The controller adopts high-performance intelligent gas sensor, which is an intelligent high-performance detection module for continuous online monitoring of multiple component gases, including TVOC, formaldehyde, methane, carbon dioxide and other gas sensors, as well as smoke detection, atmospheric pressure, temperature and humidity sensors. The controller uses a 7-inch LED display screen, which is rich in content and beautiful. It can be wall-mounted or vertical. It contains a large-capacity maintenance-free lithium battery pack, which can run continuously after power failure. The Internet of Things private network communication is adopted, which does not depend on the home network, and the communication is more reliable. Through the wireless transmission technology of the Internet of Things, the sensor data is uploaded to the cloud platform in real time. And through the analysis of big data, timely warning and alarm.