The invention discloses an edge-turning mechanism for box window surface paper of a windowed paper box. The edge-turning mechanism for the box window surface paper of the windowed paper box is used for carrying out edge-turning on the box window surface paper of a paper plate provided with a polygonal window and attached with the surface paper, wherein a drive end of a linear propulsion device isconnected with a rear end of a multi-surface conical block; a plurality of conical surfaces arranged in the circumferential direction are arranged on the front section of the multi-surface conical block; an elastic device is arranged between the rear end of each single-surface conical block and a stop block; at least one conical surface is arranged on the front section of each single-surface conical block and capable of making mutual surface-to-surface contact with a certain conical surface of the multi-surface conical block; and a push block is connected to one side close to a contact plate,of the front section of each single-surface conical block. According to the edge-turning mechanism for the box window surface paper of the windowed paper box, the surface-to-surface contact of each two conical surfaces is formed by virtue of the cooperation of the multi-surface conical block and the plurality of single-surface conical blocks, and the single-surface conical blocks are pushed by virtue of the multi-surface conical block to drive the push blocks to complete edge-turning working for the box window surface paper of the paper plate, so that mechanized edge-turning for the box windowsurface paper is realized, the production efficiency for the windowed paper box is remarkably increased, and the product quality of the windowed paper box is remarkably improved.