The excavator working mechanism model was built by using 3D modeling software Pro/E, which was imported into the dynamic analysis software ADAMS. The virtual prototype model of the excavator working mechanism was constructed by adding constraints and setting material properties and working loads in ADAMS. The electrohydraulic control system simulation model of the excavator working mechanism was established by using simulation software AMESim. The combined simulation model of the virtual prototype and the electrohydraulic control system was built, and the trajectory control of the excavator under typical digging conditions was carried out. The combined simulation results show that the actual displacement of the three working hydraulic cylinders of the excavator can better track the target displacement, and closedloop control to the excavator trajectory was realized. It provides a theoretical basis for subsequent experimental research.