When the finite element software is used to analyze the influence of multi parameter changes on the research object, it is necessary to repeatedly model, define and modify parameters. The dynamic shear extrusion connection of intermediate billet is taken as an example. The python language was used for secondary development of ABAQUS pretreatment. The kernel script program of dynamic shear extrusion connection simulation was writed. The graphic user interface of dynamic shear extrusion connection was established by using RSG plug-in. Users can input different process parameters, die parameters and blank parameters according to the actual situation to complete the pre-processing operation automatically and carry out simulation analysis. It not only effectively solves the problems of complicated and error prone model assembly, but also improves the accuracy of model assembly and simulation results. Finally, the rationality of the simulation results is compared. The feasibility of the secondary development program and graphical user interface is verified. It provides a powerful tool for the follow-up study of the influence of different reduction, overlap, edge width and other parameters on the dynamic shear connection quality of intermediate billet, and provides a reference for the secondary development of ABAQUS in other fields.