The utility model provides a well drilling discarded object separator for mud and drilling fluid in the separation well drilling discarded object, it includes: casing, conveying mechanism, baffle and pan feeding portion. Conveying mechanism is located the casing, and conveying mechanism includes: the ability first roller bearing of pivoted and second roller bearing and conveyer belt, the conveyer belt is connected with first roller bearing and the transmission of second roller bearing looks, has offered the through -hole on the conveyer belt, and the drilling fluid that the through -hole enabled in the well drilling discarded object flows out. The baffle sets up in conveying mechanism's below, with the space first cavity of share and the second cavity of conveying mechanism below. Pan feeding portion is used for to conveyer belt input well drilling discarded object to arrange the well drilling discarded object in on the conveyer belt of baffle one side, the conveyer belt is used for driving the opposite side motion of well drilling discarded object to the baffle. Adopt the utility model discloses a well drilling discarded object separator, the conveying mechanism through having the through -hole can effectively reduce the drilling fluid of accompanying the well drilling discarded object to run off, reduction in production cost with drilling fluid and slime separation.