With the increasing application of BIM technology in prefabricated electromechanical design, the establishment, splitting, grouping of BIM models and the output of machining drawings are gradually important. Based on Revit parametric programming software and visual programming, this paper uses Dynamo and Python to realize automatic pipeline splitting and quickly produce drawings that meet design specifications. Compared with the traditional manual modeling and drawing method, it greatly improves the design efficiency and drawing quality, which has the value for popularization and application.