Tunnel deformation measuring method and system and measuring robot

The invention discloses a tunnel deformation measuring method and system and a measuring robot, and relates to the technical field of engineering monitoring. The method comprises the following steps: 1, selecting an area as a reference area and determining a three-dimensional coordinate system of the reference area; 2, selecting an extended subarea which is partially overlapped with the reference area, and determining three-dimensional coordinates of monitoring point positions except the overlapped area of the extended subarea; 3, taking the determined extended subarea as a current reference area, determining a next extended subarea by using the method in the step 2, and determining a three-dimensional coordinate of a monitoring point position set by the next extended subarea; repeating the step 3 until the expansion partitions reach a preset number; and 4, polling the three-dimensional coordinates of all the monitoring point positions at different time points according to the methods in the steps 1-3, and de