The invention discloses a dry distiller for a coal-topping technology. The dry distiller is characterized by comprising a hollow cylinder and a fixed shaft, wherein the fixed shaft is provided with an inlet and an outlet, the hollow cylinder is connected with a heating device and a driving device, and the inner wall of the hollow cylinder is provided with fins. In a working process of the dry distiller, the heating device provides heat for the hollow cylinder, coal in the hollow cylinder can be heated, and the fins in the hollow cylinder are driven by the driving device to rotate along and raise the coal, thereby forming favorable heat transfer between the coal and the hollow cylinder and between the coal and the coal and uniformly heating the coal. The dry distiller is particularly suitable for heating and cracking coal or producing semi-coke coal in the coal-topping technology.