This study explores the reconstruction problem of solid models of complex surface automotive steering knuckles. A model reconstruction method based on a combination of reverse engineering and parametric design is proposed by analyzing the structural characteristics and modeling difficulties of the steering knuckle. The specific steps include: firstly, using a high-precision 3D scanner to scan the steering knuckle and obtain its surface point cloud data; Secondly, preprocess the model point cloud data, including data patching, data collection, and encapsulation, and fill and repair complex holes with missing point cloud data; Then, using Geomagic Design X software for data processing and surface reconstruction, a three-dimensional solid model of the steering joint is generated. Finally, the reconstructed steering joint solid model is subjected to “3D Comparative Analysis”, “Point Analysis”, and “Geometric Deviation” accuracy verification and optimization using Geomagic Control X precision analysis software. The experimental results show that this method can effectively improve the modeling accuracy and efficiency of complex surface steering knuckle models, providing new ideas for the digital design and manufacturing of automotive components.