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In order to solve the problem that the magnitude and frequency of excitation force output by existing exciter cannot be adjusted independently, the amplitude and frequency of excitation force cannot meet the demand of fruit vibration harvesting at the same time, TRIZ theory was used to construct the model of exciter and fruit tree matter-field. According to the matter-field model and the physical conflict solving method, the eccentric block layout of the excitation force amplitude and frequency of the eccentric block exciter was obtained, and the schemes of the four eccentric block exciter and the radius adjustable exciter were proposed. By comparing the dynamic performance of the two designs, it was found that the moment of inertia of the radius adjustable exciter was lower than that of the four eccentric blocks. The smaller the moment of inertia of the shaker was, the smaller the torque and power required during the rotation of the shaker was. When the four eccentric blocks were rotating, the phase angle size of each eccentric block was changed with time, so it was very difficult to adjust the size of the phase angle φ. In the radius adjustable exciter, the eccentric block and the rotating axis were relatively fixed in the radial direction, and the eccentric block radius was relatively static in the axial direction, and it was relatively easy to adjust the eccentric block radius in the axial direction. Therefore, the radius adjustable exciter was more suitable for the amplitude-frequency regulation mechanism of exciting force in the process of fruit vibration harvesting. Three different frequencies and amplitudes were applied to citrus trees. Citrus trees were used as test subjects to apply three different frequencies and amplitudes of excitation forces to different fruit trees with adjustable radius exciter. The results showed that the detachment rate of fruit was increased with the increase of the frequency of excitation force. At the same time, when the exciting frequency was constant, the amplitude of the exciting force was increased, and the detachment rate of the fruit also showed an increasing trend. When the exciting frequency was 19Hz and the stroke of the screw nut was 70mm, the average detachment rate of the fruit was 86.3%. The results showed that the effect of excitation frequency on the detachment rate was greater than that of excitation force amplitude. The radius adjustable exciter can change the amplitude of the exciting force and improve the fruit harvest rate. At the same time, the amplitude-frequency independent regulation characteristic of the radius adjustable exciter can reduce the amplitude to prevent the damage of fruit trees when the excitation force frequency was large.