The system is mainly composed of array displacement meter, data acquisition instrument and monitoring and early warning cloud platform. The array displacement meter realizes real-time monitoring of deep deformation displacement, surface deformation displacement and horizontal settlement. The monitoring data is transmitted to the monitoring and early warning cloud platform in real time through wired or wireless mode for processing, analysis, storage, display and release of data, and early warning of dangerous areas. System interconnection and interaction can be realized through diversified early warning reminders such as system home page, SMS and e-mail. It is applicable to the early warning and monitoring of landslide and track bed settlement of railway line.