Structure tree reconstruction method of BIM model

The invention provides a structure tree reconstruction method of a BIM (Building Information Modeling) model. The method comprises the following steps: classifying building components according to classification levels divided layer by layer and designing a coding system; a building BIM model is created and generated, and an IFC physical file is exported; analyzing semantics of the IFC physical file and extracting attribute information of an IFC entity corresponding to each building component according to the coding system; coding the building component according to the coding system and the attribute information; the corresponding building component codes are marked into all the classified building components of the created and generated BIM model; the coded building component data is stored in a database, and data sharing of all participants is achieved; the codes serve as unique identifiers of the building components, and identity recognition is conducted on the building components; and analyzing the coded