The invention relates to a method and a device for displaying a window shade. The method comprises the following steps: acquiring size information and position information of a main window, and determining size information and position information of a subordinate window, wherein the main window is a non-layered window, and the subordinate window is a layered window and comprises a frame subordinate window and a vertex subordinate window; calculating the transparency of each pixel in the frame subordinate window according to the distance from each pixel in the frame subordinate window to the corresponding frame on the main window; calculating the transparency of each pixel in the vertex subordinate window according to the distance from each pixel in the vertex subordinate window to the corresponding vertex on the main window; and splicing and displaying the frame subordinate window on the frame of the main window, and splicing and displaying the vertex subordinate window on the vertex of the main window. According to the method and the device, system memory footprint can be reduced when the window shade is displayed, the window shade can be displayed at a corner in a smooth transition manner to avoid forming hard shade, and a better display effect is achieved.