Abstract: The small UAV is an important tool in geological survey with the advantages of low cost and flexible operation. The monitoring of surface subsidence and deformation is a key to controlling the surface movement and deformation related to coal seams mining and subsidence. This paper focuses on the investigation of coal mining subsidence monitoring in the Y120212 working face in Yangchangwan coal mine, by the process of field reconnaissance and controlling point layout, UAV route planning and execution, 4D product production process and monitoring methods, so as to apply unmanned aerial vehicle remote sensing technology to monitoring the mine geological collapse. The research shows that the maximum subsidence value of the Y120212 working surface reaches 6.5m by comparison of the DSM processing of unmanned aerial vehicle (UAV) remote sensing technology and multi period ground elevation. A comparative study of the unmanned aerial vehicle remote sensing technology shows that it can monitor the surface subsidence deformation related to coal mining subsidence area. The technology is also a new means for monitoring the ground subsidence of the coal mine.