Automated monitoring technology is one of the key development directions of promoting construction informatization. The information technology is now gradually applied to realize the data collection and analysis, information feedback and real-time location query of project monitoring, so as to realize the information safety construction management. This paper takes Wanjiali Square Station of Changsha Metro Line 5 as an engineering example, for the first time to use the automatic monitoring system, AutoMos, to monitor the construction process of the foundation pit of the metro station, acquiring effective monitoring data in the excavation process, including horizontal displacement of retaining structure, settlement deformation of surrounding buildings, settlement deformation of viaduct pier in foundation pit, and settlement deformation analysis of existing station column. The main conclusions are as follows: (1) During the excavation of foundation pit, the horizontal displacement curve of the retaining structure is in broken line shape at the distance from the middle of the foundation pit, and partially in zigzag shape. Compared with the traditional inclinometer monitoring, the automatic monitoring results of automos are consistent with the horizontal displacement trend of the envelope, which verifies the validity and accuracy of the automatic data; (2) The accumulated settlement of the house is linear with the distance to the center of the left and right tunnels, which is affected by the excavation of the left and right lines. The accumulated settlement of the house monitoring points is within 8mm, which meets the requirements of the specifications; (3) Affected by the uneven settlement and consolidation deformation of soil caused by the deformation inside the retaining structure, the accumulated settlement of Q17 and Q18 monitoring points of viaduct piers near the North foundation pit is -5.79mm and -7.01mm respectively, and the maximum accumulated settlement of Q21 point is -6.35mm; (4) The settlement monitoring point of the existing station column close to the North foundation pit, LZ4, increases with the settlement deformation of the foundation pit excavation until the negative first floor slab is stable after pouring. The automatic monitoring based on AutoMos fully embodies its advantages and functions in the monitoring process, which has important engineering application value and guiding significance.