System and method for measuring deformation of foundation pit

The invention discloses a system and method for measuring the deformation of a foundation pit. The system includes deformation measuring parts which are arranged on all foundation pit deformation measuring points and are used for measuring the foundation pit deformation at the measuring points. The structure of the system is characterized in that each of the deformation measuring parts includes asteel wire and a sensor module; the bottom end of each steel wire is fixed to the foundation pit bottom close to a side wall of the foundation pit, and the top end of each steel wire is fixedly connected with the upper edge of the side wall of the foundation pit; each sensor module includes an inclination angle sensor for measuring the inclination angle of each steel wire; the deformation measuring parts are installed before the measurement starts; during installation, the steel wires are pre-tensioned and are enabled to be in a vertically stretched state. The system and method can efficiently, accurately and stably m