The article studies the monitoring information integration method based on IFC, sorts out the data structure shared in the BIM platform, masters the relationship and types of BIM data structures, and establishes a BIM data structure library. The BIM data standard (Industry Foundation Classes, IFC) is extended by the method of extending the attribute set, by defining attributes related to the model and mapping the data one-to-one, IFC-related monitoring data is expressed. Furthermore, the method of batch integration of monitoring data into IFC files is studied, and the corresponding IFC file reading and writing program is set up. Through this method, the monitoring information of the foundation pit construction process is integrated on the BIM platform to realize intelligent integration process of BIM-based foundation pit and underground engineering monitoring information. The study provides reference for related research.