The invention relates to a BIM-based building information integrated management system and a construction method thereof, and belongs to the technical field of information integrated management. The management system disclosed by the invention comprises a data layer, an information model layer and a function application layer, wherein the data layer realizes information collection, coding, classification and storage; the information model layer creates a building information model with model primitive basic data extracted from the data layer and updates and improves an information model with extended data to provide required model information for each project participant; the function application layer analyzes and applies various shared model information acquired by the information modellayer, and exchanges and shares information obtained by the respective analysis and application, which can dynamically process a large number of information about engineering project design, construction, completion acceptance, operation and maintenance with high quality, ensure efficient information circulation, realize project management informationization and make a best decision for all stagesof a whole life cycle.