The invention relates to agricultural machinery, in particular to a design method and a device applicable to a corn sheller; the device comprises five parts, i.e. power transmission mechanisms, a threshing mechanism, a conveying mechanism, an impurity removing mechanism and a frame, and is characterized in that a drum of the threshing mechanism is provided with a screen hole, and the longitudinal direction of the screen hole is longer than the horizontal direction thereof; the power transmission mechanisms are arranged on both sides of the frame; the conveying mechanism comprises a pushing device and an elevating device, the pushing device is arranged on the lower side of the frame, the elevating device is arranged on one side of the frame, and the threshing mechanism and the impurity removing mechanism are fixed on the frame; each power transmission mechanism comprises a power access shaft head and a power access wheel; and when the power access shaft head serves as a power access point, the power access shaft head is connected with a power output PTO, a diesel engine or a motor in a transmission way. The invention not only has high efficiency and high purification to dry corn with skin or wet corn with skin, but also has simple structure, and can be combined with any power source.