The utility model discloses a circulation stay cord formula sun blind, including the back timber, the floorbar, a plurality of blind pieces, the runner, the circulation stay cord, accuse curtain mechanism, erect the corner ladder and take end and transcapsidation relatively fixed, it is connected with the pivot and can coils and change epaxial receipts curtain rope to be equipped with one end in the pivot, it is connected with the pivot to receive curtain rope upper end, receive curtain rope lower extreme and bottom beam connected, be equipped with on the blind piece and receive the wire rope handling hole that the curtain rope corresponds, the wire rope handling hole is in between two perpendicular corner ladder areas, receive the curtain rope and pass all wire rope handling holes that correspond from top to bottom in proper order, wire rope handling hole aperture is greater than receives curtain rope external diameter. The beneficial effects of the utility model are that: it is rational in infrastructure, can effectively open, close, it is simple and efficient to handle, and the blind piece can be opened with the realization by integrally lift up by a wide margin, can effectively compensate the shading, obscure effect is better, have the function that automatically regulated received curtain rope position, carrying out the shutter when curling up, the phenomenon that crisscross winding can not appear, knot between each ring of receipts curtain rope curled up.