Abstract: An intelligent safety monitoring system of mineshaft based on internet of things is designed and developed to improve the transmission rate of HD videos and realize the video data sharing.Based on the three-layer architecture model，the functions and interconnection schemes of the four sub modules which are front-end video capture device，mineshaft control device，mineshaft video data (MVD) server and management software are introduced.The system adopting H.264 compression codec algorithm to compress the video data improves the efficiency of video transmission.The MVD server is used to share video data，and multiple threads are used to deal with video data transmission among multiple mineshafts simultaneously.The system adopts the internet of things technology integrating the video capture，storage and analysis together，which can simplify the operation and improve the transmission rate of HD video data.It can also share the video data between different mines.

Key words: Safety monitoring, Internet of things, Three-layer architecture, Video coding, Video sharing