The invention discloses a steel structure BIM information management method and system based on a cloud server. Based on the visualization of the three-dimensional project model, the method utilizes data collection, real-time monitoring, analysis and forecasting means to timely grasp the project and the progress, to monitor the early warning and to analyze and predict the project operation condition by unified management of the data, business flow, progress, cost and the like of the project life cycle, so that the enterprise project management mode is improved, and the construction of streamlined and informatization enterprise management mode is promoted. The system integrates a project data subsystem, a business flow subsystem, a BIM application subsystem, an early warning subsystem, a reporting subsystem, a background maintenance subsystem, a mobile terminal and a cloud server, and intelligently manages the project from the design, construction and operation of the life cycle, thereby shortening the project construction period, reducing the management cost and promoting the healthy development of the enterprise.