This paper illustrates the reinforcement and transformation process of a concrete frame structured machine house based on BIM technology. A BIM model is established by using Revit based on the current situation of existing buildings to realize the 3D visualization and collaborative work. The optimization of building renovation plans was achieved from the aspects of pipeline optimization, collision detection (such as collision of column with pipeline and window, collision of beam with pipeline, etc.) and so on. The sunshine analysis function in Revit is helpful to rationally arrange the room, partition material, and etc. The application of BIM technology in the reinforcement of the existing building will avoid changes encountered in the traditional reinforcement and reconstruction.