Abstract: To promote the intelligent and green transformation of the coal industry and address issues such as low precision, poor collaboration, frequent conflicts, and low visualization inherent in traditional 2D design within coal preparation plant upgrading and expansion projects, this study adopts Building Information Modeling (BIM) forward design technology. An integrated digital design system was established, utilizing ProjectWise as the collaborative core, supported by OpenBuildings Designer and OpenPlant Modeler for modeling, and integrated with independently developed parametric tools. Focusing on the main plant and the screening and crushing workshop of the Xiaobaodang Coal Preparation Plant upgrading and expansion project, systematic research was conducted on multi-disciplinary collaborative modeling, full-process clash detection, parametric component design, and direct drawing generation from models. The results indicate that this technological approach enabled the identification of 58 clash points and the optimization of 35 valid clashes during the design phase. Furthermore, the drawing error rate was reduced by approximately 30%, and the overall design cycle was shortened by about 15%. The project successfully achieved multi-disciplinary model integration, digital delivery, and the linked application of model data with the equipment QR code system in the operation and maintenance phase. BIM forward design can significantly improve the design precision, collaborative efficiency, and management level of coal preparation plant upgrading and expansion projects, mitigate the risk of construction rework, and promote information management throughout the entire lifecycle of coal washing and preparation engineering. Ultimately, it enhances the design quality and construction efficiency of technical modification projects in large-scale coal preparation plants, accelerating the digital and intelligent upgrading of the coal industry.