The invention discloses a CATIA-based bridge BIM creating method. The method comprises the steps of determining assembly and component name and layer division of a bridge BIM, adopting a Mindjet MindManager for drawing a thought induced graph, and exporting a .csv format file in an outline mode; dividing a BOM form into a coding system and a coding list, editing and arranging the two forms through EXCEL, adopting a linear classification method for performing layering division on the bridge BIM, generating assembly and component names and serial numbers, and clearing attribute information needing to be loaded into the assemblies and components; on the basis of a CATIA secondary development interface, importing the BOM form, and automatically generating a structural tree and a component file folder; according to the BOM form, automatically generating PRODUCT attributes and parameter attribute information inside PART; on the basis of the generated structural tree and the file folder, performing CATIA geometric model creating. The method has the advantages that non-geometrical information can be loaded and model files can be automatically generated in batches, creation works of geometrical information and non-geometrical information are separated, and modeling can be performed according to the actual requirement of the certain specific stage.