The process of data acquisition, analysis, processing and risk forecasting in the traditional deformation monitoring in tunnel construction are independent. Therefore, the response to risks is always untimely. To solve this problem, the paper studies and implements Georobotbased automatic deformation monitoring in tunnel construction. The functions of automatic monitoring data acquisition and remote storage, automatic data analysis and early warning are realized by means of Georobot, Visual Basic, GeoCOM and SQL Sever database. The purpose of the automatic monitoring of tunnel deformation is achieved; the tunnel construction safety is guaranteed. The hardware structure, software design and result processing and output of the whole system are discussed in this paper. The idea and method of automatic deformation monitoring have positive reference significance for the deformation monitoring in tunnel construction.