In order to study the evolution law of force and deformation of super foundation pit and settlement of adjacent buildings with foundation pit excavation in soil-rock combination binary stratum. , Based on the super deep foundation pit project of pile-anchor supporting structure system of Qingdao Haitian-Central Urban complex, the axial force of prestressed anchor cable, horizontal and vertical displacement of foundation pit and settlement of surrounding buildings were monitored in real time. The results show that the axial force of prestressed anchor cable varies with time in three stages: rapid decline, stable change and basic stability. The average axial force loss rate of anchor cable is about 15.08%. The maximum horizontal displacement of the foundation pit is 12.30 mm, the maximum vertical displacement is 11.01 mm, and the maximum settlement of the adjacent buildings is 1.2 mm, which is far less than the allowable deformation value of the design and the current "Monitoring Technical Standard for Building Foundation Pit engineering", indicating that the pile-anchor retaining structure system can effectively control the deformation of the foundation pit and ensure the safety of adjacent buildings. At the same time, it is shown that the design scheme of the foundation pit has a large space for optimization, so as to save the project cost. The research results have important reference value for the design of ultra-deep foundation pit retaining structure under similar geological conditions.