A funnel control device is fixed on a shear box or respective cells in various soil mechanics/dynamics testing devices, and the funnel control device enables to produce soil samples to be tested by discharging a soil through a funnel into a sample preparation mold at a given axis and rate. The funnel control device includes at least one supporting body for being placed on the soil mechanics/dynamics testing device, at least one holder, wherein the at least one holder is provided on the at least one supporting body to be movable in vertical axis and the funnel is placed on the at least one holder, at least one driving member, wherein the at least one driving member is located in or on the at least one supporting body and is used for moving the at least one holder in the vertical axis.