A walnut vibrating harvester was designed based on Solidworks for 3D modeling, which is mainly composed of the clamping device, the exciting device and the frame. The eccentric block running in the shaker generates the exciting force, which acts on the trunk of the walnut to vibrate the walnut on the side branch. When the pulling force greater than the stem force, the fruit stem could be break to cause the fruit to fall off. The 3D model of the walnut tree was set up by using UG and was imported into workbench for modal analysis. The optimum excitation frequency was obtained at 15.41 Hz with the clamping force of 3.185 kN. The eccentric block was designed and its natural frequency was revealed to be 1 626.1-5 072.6 Hz by finite element analysis. The static analysis of the eccentric block structure shows that the deformation is 0.022 mm and the strain is 55.12 MPa. The structure of the eccentric block is stable, which meets the design requirements.