Spiral stairway type spread dryer

PURPOSE: A dispersing dryer in a spiral step type is provided to uniformly dry by a continuous replacing function while rapidly drying an object by spreading with a spiral wing and expanding the contact area of the heating surface. CONSTITUTION: A dispersing dryer in a spiral step type comprises an inner case (10), a spiral wing (30), a dispersing wing (40), and a thermal medium case (60). The spiral wing is formed in a spiral shape to face a rotary shaft (11) in the flat surface. The spiral wing includes a round unit rounded to the upper direction on one side. A resisting accommodating unit is formed to be bent in the upper direction on an opposite side of the round unit. A rotary inserting hole has the width which is longer than the diameter of a rotary pin and is formed in a curved shape to the identical direction of the round unit and the dispersing wing can move forward and backward based on the rotary pin. The round unit rotates based on the rotary pin and can ascend and descend.