Aimed at the existing steam injection boiler with wet saturated steam, the steam overheating and tube-burst pre-warning device is developed. The judgment basis and algorithm model of steam overheating monitoring are given, and the composition of the design device, component connection and man-machine interface are optimized. According to the physical properties of water and steam, the steam state is divided into four operation conditions: overheating alarm zone, overheating warning zone, operating zone and safety zone. Based on this, the visual coordinate diagram and the overheating monitoring histogram of the steam operating condition monitoring are designed in the man-machine interface. The steam overheating incidents are classified and filtered to make the device more reliable for steam overheating and early warning. Through field application data analysis, the effectiveness of the device is verified.