Under actual working conditions,the working device of hydraulic excavator is subject to large loads which has strong time-varying characteristics.Therefore,various forms of failure are more likely to occur in each component bar and hydraulic cylinder of the working device.To solve the above problems,a hydraulic excavator was selected as the research object.According to the actual working conditions of the hydraulic excavator working device,the virtual prototype model of the hydraulic excavator was established using the multi-body dynamics software ADAMS and the material model was established using the discrete element software EDEM.Through the DEM-MBD coupling simulation analysis method,the dynamic simulation analysis of the working device of the hydraulic excavator was carried out.The force change curves of the bucket in the process of excavating materials and the force nephograms of the bucket at different times were mainly obtained.Through analyze the results,the force change of the bucket in the process of excavation can be obtained,which provides a theoretical basis for the finite element analysis and optimization design of the bucket.