Abstract: In order to overcome the problems of low monitoring efficiency and poor accuracy of traditional methods for cross-border mining and over-limit mining in open-pit mines，based on UAV aerial monitoring，the identification algorithm of mine cross-border mining and over-limit mining are established. Then，the secondary mining platform and mining variation monitoring system are used to realize the rapid analysis of aerial data and the dynamic monitoring of mining range. The practical application shows that the accuracy of this monitoring technology reaches 97.4%，the monitoring efficiency is improved by 20 times，and the monitoring accuracy of mining is controlled at ±1.1 m. This practice has reference value for realizing the intelligence of open-pit mine monitoring and improving the efficiency of mine monitoring.

Key words: open-pit mine, UAV, aviation monitoring, cross-border mining, over-limit mining