The invention provides a differential type separating platform which comprises a stand; a flexible drum and a rigid drum which are mutually parallel and are connected with a driving device through a transmission device can be rotationally fixed and supported on the stand, and a clearance is arranged between the flexible drum and the rigid drum; the transmission device enables the flexible drum and the rigid drum to oppositely rotate, and the rotational speed of the flexible drum is less than that of the rigid drum; or the transmission device adopts the matching relationship with the outside diameters of the flexible drum and the rigid drum, i.e., the linear speed on the outer circumference of the flexible drum is less than that of the rigid drum; a soft material layer is fixedly arranged on the rigid drum wall of the flexible drum, and the drum wall of the rigid drum is made of rigid material; and a plurality of grooves are arranged on the rigid drum along the axial direction in a penetration way, and the grooves are circumferentially distributed in parallel around the drum wall. The differential type separating platform can effectively separate poppy shells and stems, cannot enable the poppy shells to be extruded into powder due to excessive extrusion, is favorable for the cleaning of the poppy stems, the shells and the seeds in the later period, and also provides a foundation for the manufacturing and the development of the poppy combine harvester.