Abstract: In response to higher requirements of potato harvester harvesting operations，simulation analysis and parameter optimization of potato harvester conveyor chain were carried out.Through analysis，the larger the cross-sectional radius of potato was，the more unstable it would be during transportation process.Increasing distance between adjacent grids could improve stability of potato transportation without leakage of potatoes.Based on ADAMS，potato rolling under different horizontal angles of conveyor chain was analyzed.Speed change of potato rolls was related to inclination of conveyor chain.When it did not exceed 30°，the potato roll speed could reach a stable state without continuing to increase.It could provide a basis for design of potato conveyor chain.Relationship between potato soil separation effect and conveyor device parameters was established.Through analysis and test，a conveyor chain with a center distance h of 1 500 mm，a conveyor chain inclination angle of 25° and a lifting height of 634 mm was designed.It could realize transportation and separation of potatoes.