Indoor space extraction method and system based on building information model

The invention belongs to the field of building information, and particularly discloses an indoor space extraction method and system based on a building information model, and the method comprises the following steps: S1, carrying out the extraction according to the IFC data of the building information model, and obtaining model components forming a building indoor space surrounding structure; s2, generating a three-dimensional convex hull of the model component; s3, carrying out difference processing on the three-dimensional convex hull and the model component, and extracting to obtain an overall indoor space; and S4, voxelization is carried out on the whole indoor space, voxel blocks are divided according to actual functions, the whole indoor space is divided into a plurality of indoor subspaces, and indoor space extraction is completed. According to the method, the overall indoor space and subspace of the building information model can be accurately extracted, a basis is provided for follow-up semantic expa