Finite element analysis and structure optimization were carried out for a working device of 5 t wheeled mine loader.SolidWorks software was employed to establish an identical 3D model as the actual situation.ANSYS software was used to analyze the static structure under typical load condition,and the total deformation diagram and equal effect force diagram of working device were obtained to confirm the stress concentration area.The stress concentration area was reasonably improved to realize the structural optimization of working device.The research result can be used as a basis for the design and structure optimization of working device of mine loader,and provide reference for the design of construction machinery.