The invention provides an intelligent building system based on BIM and a management thereof, which belongs to the technical field of intelligent buildings. The system comprises a data acquisition module, a data processing module, a data storage module, a data output module, a cloud resource dispatching module, an intelligent city system module, a BIM application module and a BIM software learning module. The data processing module comprises a collision checking module, a collision calling module, a three-dimensional rendering module, a quick calculation module, a resource planning module, a multi-operation comparison module, a virtual construction module, a device operation and maintenance data integration module, an operation data output module, a BIM model data filtering module, a device parameter filtering module and a surrounding environment data filtering module. According to the invention, three-dimensional visualization display of a building is realized; all kinds of information of building operation and maintenance are highly integrated; information management automation is realized; and the cloud resource dispatching module retrieves intelligent city system data, BIM application data and BIM software learning data to realize function diversification.