The present invention relates to double fabric blinds and, more particularly, to a device for adjusting a fabric angle of the double fabric blinds, which is capable of finely adjusting an degree of openness of a front sheet, wherein a plurality of balls are sequentially held in a holding groove, e.g., as four or eight balls, inserted into an insertion groove of a rotation component, wherein the plurality of balls are rotated in a guide groove of a stopper by approximately 90 degrees or 45 degrees, thereby improving safety and omitting the use of a conventional string.