Waistband opening device for garment making

The underpants opening device comprises a base, a sliding groove is formed in the middle of the front end of the base, adjusting mechanisms are connected to the left side and the right side in the sliding groove respectively in a sliding mode, the two adjusting mechanisms are distributed in a bilateral symmetry mode, a plurality of fixing blocks are fixedly connected to the upper portion of the front end of the base at equal intervals, and the fixing blocks are connected with the sliding groove in a sliding mode. The positions of the multiple fixing blocks in the horizontal direction are consistent, through adjusting holes are formed in the middles of the upper ends of the multiple fixing blocks correspondingly, adjusting screw rods are in threaded connection with the inner walls of the adjusting holes correspondingly, and the lower portions of the outer surfaces of the two adjusting screw rods corresponding to the vertical positions of the two adjusting mechanisms are in threaded connection with the two adju