Studying on the current two-dimensional and three-dimensional parallel design environment of urban rail transit engineering, this paper analyzes the current situation and problems faced in the application and management of BIM technology. What's more, this paper proposes a way of unified management by the constructor-led and the overall design unit, and develops a digital management platform based on cloud technology, which is proved by practice. Based on the digital management platform, the digital management platform can effectively achieve the integrated collaborative design and management of two-dimensional and three-dimensional aspects in rail transit engineering, which is helpful to promote the transformation from two-dimensional design to three-dimensional design, and has certain promotion value.