Abstract: Aiming at the engineering problems such as many safety hidden dangers during the construction of deep foundation pit project and the difficulty of monitoring, an automated monitoring system based on wireless sensor network was developed and applied in the actual project to provide real-time, accurate, continuous and visualized data for the monitoring of the foundation pit, and to provide a guarantee for the safe and smooth construction of the foundation pit. By describing and analyzing the composition and design principle of the system, the data acquisition and transmission mode, the characteristics of the functional modules and the application effect, the feasibility and effectiveness of the system in the monitoring of deep foundation pit engineering are verified.