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Removing-soil devices are very important to the peanut combine harvester, and directly affect the work performance of the follow-up peanut stripping devices. According to the poor performance in removing soil of the traditional removing-soil devices used in the peanut combine harvester, a new removing soil device with spring tooth is designed. Based on the analysis of removing-soil principle, this paper analyzes the performance of removing soil and gets the regression equation between eccentric-wheel speed, eccentricity, spring tooth arm and removing soil performance index (removing soil rate and peanuts falling rate). Finally, this paper draws a conclusion that the optimum removing soil performance can be obtained under the condition as following: eccentric wheel speed is 23r/min, the eccentricity is 38mm, the length of spring tooth’s arm is 125mm. Every index of the performance meets the demands of design.