As a new mode of transportation, urban rail transit is playing an increasingly important role in urban public transportation. The subway tunnel automatic monitoring system is convenient for enterprises and safety supervision departments to quickly grasp the latest developments of technical indicators closely related to engineering safety, and is conducive to timely grasping the operating status and safety status of the project. Combining IoT technology, cloud computing, wireless communication and other technologies to build a set of intelligent, safe, and fast automated information collection, processing, and analysis intelligent systems, GeoRTK provides a more optimized solution for the informatization of subway tunnel monitoring.As a new mode of transportation, urban rail transit is playing an increasingly important role in urban public transportation. The subway tunnel automatic monitoring system is convenient for enterprises and safety supervision departments to quickly grasp the latest developments of technical indicators closely related to engineering safety, and is conducive to timely grasping the operating status and safety status of the project. Combining IoT technology, cloud computing, wireless communication and other technologies to build a set of intelligent, safe, and fast automated information collection, processing, and analysis intelligent systems, GeoRTK provides a more optimized solution for the informatization of subway tunnel monitoring.