In　order　to　improve　the　operation　effect　of　sweet　potato　harvester　in　China,　this　paper　uses　EDEM　to　analyze　the　single-factor　simulation　of　the　potato　soil　transport　separation　mechanism,　and　analyzes　the　simulation　results　by　using　the　collision　normal　force　and　transport　efficiency　of　sweet　potato　as　the　index　parameters.　The　field　experiment　was　designed　to　verify,　and　the　test　results　were　consistent　with　the　simulation　results,　which　proved　the　feasibility　of　using　the　discrete　element　method　to　simulate　the　operation　process　of　the　potato　soil　transport　separation　mechanism.　However,　the　actual　operation　effect　of　the　common　potato　soil　transport　separation　mechanism　is　the　result　of　the　joint　influence　of　multiple　parameters.　Therefore,　based　on　the　EDEM-based　basic　simulation,　the　collision　normal　force　and　the　transport　efficiency　are　the　optimization　objectives,　and　the　orthogonal　simulation　experiment　with　interaction　is　used　to　optimize　the　parameters,　and　two　sets　of　parameter　optimization　combinations　are　obtained.　Based　on　the　secondary　development　of　EDEM　software,　the　number　of　bond　breaks　and　the　change　trend　of　large　soil　particles　were　used　as　evaluation　indexes　to　simulate　the　two　sets　of　working　parameters,　and　finally　the　optimal　parameters　were　obtained.　The　combination　is　a　bar　lift　with　a　line　speed　of　2.3　m/s,　an　amplitude　of　8　mm,　and　an　inclination　of　18°.　©　2019　IEEE.