Abstract: Automatic drawing review based on BIM is of great significance to promote the high-quality development of the construction industry. However, the existing automatic drawing review technology is difficult to solve the general detection problem of irregular room components. This paper proposes a method of building space component detection for BIM automatic drawing review. This method forms an irregular polyhedron by establishing a room ground model, calculating the room height as the room growth height, and growing the specified height in the specified direction. The search results are then integrated. When integrating the search results, the closed geometric information of the bottom contour of the room and the height information of the room can be accurately obtained. By setting accurate filtering conditions to obtain components that meet the requirements. Finally, combined with Revit and C# code, an application example is given. This method can effectively search the components in different room types, which is practical and universal, and can provide better support for the automatic review of construction drawings based on BIM technology.