Abstract: Open-pit mines have large coverage，complex working conditions and many safety blind spots. In order to improve the level of mine information safety management，through the analysis of a large number of hidden danger accidents that have occurred，a three-dimensional dynamic model of hidden dan⁃ ger sources is established，and the basis for hidden danger identification of open-pit mines is obtained; On this basis，a multi-dimensional risk assessment and closed-loop treatment process is designed to form a hidden danger troubleshooting and governance model; Establish the wireless Internet of things architecture based on information layer，transmission layer and application layer，introduce offline data storage and au⁃ tomatic retransmission technology with the help of intelligent PDA terminal equipment，integrate end cloud service sharing，and realize the intelligent collection，processing and application of hidden danger informa⁃ tion; The function modules of hidden danger identification，processing and data analysis system are con⁃ structed，and the system software platform is developed，which provides a good idea for the discovery， treatment，prevention and accident traceability analysis of hidden dangers in open-pit mines. The results show that the system operation can significantly improve the screening rate of fixed hidden danger points in open-pit mines，enhance the risk identification ability of employees，promote the preparation of targeted plans，facilitate the establishment of a convenient and effective hidden danger screening and treatment sys⁃ tem，and realize the normalization and scientific management and control of hidden dangers in open-pit mines.

Key words: open-pit mine, hidden danger identification, troubleshooting and treatment model, PDA, software platform