Abstract: To address issues of poor compatibility, low hitch quality, insufficient stability, and low efficiency during hitching process between tractors and agricultural implements, a new rear suspension agricultural fast hitch device for tractors was designed．Taking Dongfanghong 176.4 kW tractor as power matching model, 3D model of hitch device was constructed using Solidworks software．Then, static simulation was carried out through ANSYS Workbench to analyze hitch state and working state between main and auxiliary machines of fast hitch device, obtaining maximum deformation and maximum equivalent stress values．Finally, dynamic simulation was conducted using ADAMS software to verify motion stability and docking feasibility during hitching process．Static simulation results showed that during hitching state, fast hitch device's main machine exhibited maximum deformation of 0.006 mm and maximum equivalent stress of 13.6 MPa, while auxiliary machine exhibited maximum deformation of 0.320 mm and maximum equivalent stress of 100.5 MPa．During working state, fast hitch device's main machine exhibited maximum deformation of 0.026 mm and maximum equivalent stress of 47.4 MPa, while auxiliary machine（made of 40Cr alloy steel）exhibited maximum deformation of 0.871 mm and maximum equivalent stress of 263.9 MPa．Both values were less than allowable stress of 40Cr alloy steel, meeting design requirements．Dynamic simulation results indicated that fast hitch device's main machine centroid displacement curve remained stable．Rigid body collision occured between 1.2 and 2.0 seconds, with stable docking achieved after 2.0 seconds．Technical scheme and theoretical reference were provided for realizing efficient and stable hitching between tractors and agricultural implements．