Abstract: Research on dynamic modeling of multi-energy domain and electric coupling system around Delta type 3D printer. Based on the advantage of screw bond graph in building the dynamic model of coupled parallel robot, the printer's mechanical ontology subsystem is constructed. Combining with the dynamic model of driving subsystem established by traditional bond graph, the global dynamic model of the mechanical-electrical coupling of the printer system is obtained. The relationship between energy transfer and exchange among the energy domains of the system is described visually and intuitively, and the transfer relationship of motion force among the components is embodied. Finally, the rationality of the global dynamic model of the system is verified by comparing the results of theoretical calculation by MATLAB software and numerical simulation by ADAMS software, which lays a foundation for the study of dynamic control and provides a new idea for the dynamic modeling of printer system