Abstract: Coastal dunes record the evolution process of the dynamic geomorphological system in the coastal zone, containing rich information on climate change, sea level changes, environmental evolution, and so on. It plays an important indicative role in global change research. In response to the dynamic changes caused by extreme weather, coastal erosion, and human activities, we propose to use UAV LiDAR technology to conduct a three-stage full coverage surface monitoring of the morphological changes of the ten thousand meter coastal dunes in Haiyang. The research results indicate that from July 2017 to April 2018, the overall morphology of the coastal sand dunes in the study area was relatively stable, and there was a slight erosion trend in some sections of the sand dunes on the front shore. From April 2018 to October 2018, the morphology of coastal dunes remained largely unchanged on the backside, while slight erosion occurred at the front edge of the sand dunes. This study is beneficial for providing precise targets for the remediation and restoration of eroded beach areas in the next step, and can also provide technical support and information reference for the ecological protection, coastal erosion prevention and control, and environmental evolution of the Haiyang Ten Thousand Meters Beach Marine Nature Reserve.