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Aiming at the problems of high damage and low efficiency in corn ear harvesting, based on the original research of vibration picking technology, a new type of ear picking device based on elliptical crosssection was developed. Based on the conditions of vibration picking to realize the effective transmission of vibration waved by clamping the fruit handle with the excitation roller, the determination method of the structural parameters of this type of ear picking roller was determined and an elliptical vibration testbed was established. Through the orthogonal test, the main and secondary factors affecting the ear gnawing rate, threshing rate and stem breaking rate were determined as follows: the ratio of the long and short diameter of the exciting roller, the rotation speed of the snapping roller and the diameter of the base circle of the exciting roller. The better combination was determined, that was, the ratio of the long and short diameter of the exciting roller was 0.7, the diameter of the base circle of the exciting roller was 7.5cm, and the rotation speed of the stripping roller was 1000r/min, the ear gnawing rate was 0.38%, the seed dropping rate was 0.12%, and the stalk breaking rate was 0.49%, which were all lower than the requirements of the national corn harvesting machinery technical standards. The experimental verification was carried out under the optimal combination of parameters. The results showed that the ratio of short length to diameter of exciting roller was 0.7, the diameter of base circle of exciting roller was 7.5cm, the rotation speed of snapping roller was 1000r/min, the rate of ear gnawing was 0.39%, the rate of falling grain was 0.12%, and the rate of stalk breaking was 0.48%. The test results showed that the results were basically consistent with the previous test results. 