Abstract: According to the soil characteristics and planting agronomy of peanut in South China,an economic and applicable peanut harvester was developed.This paper introduces the overall structure and working principle of the machine,and designs and calculates the key parts of the machine.This machine selects the secondary separation cleaning device which is composed of conveying separation chain grate and vibrating screen.It has good separation effect of loam and fruit seedling,small loss rate,compact structure and high reliability.It is suitable for peanut harvesting under various soil and planting agronomic conditions in South China.Through the field performance experiment,the productivity of the machine was 0.17 hm~2/h,the fruit-loss rate was 1.5%,the damage rate was 0.15%,and the impurity content was 17%.All indexes met the requirements of industry standards.