The utility model discloses a trousers dress waist mould, this mould includes splint, bottom plate and the panel that connects gradually, is equipped with the first fare groove and the second fare groove of mutual correspondence on bottom plate and the panel respectively, the outer edge and the first fare groove adaptation of splint. During the use, lay trousers girdle facet material on the bottomplate earlier, cover splint, spread waist of trousers inside lining again on the panel, cover the panel again, at this moment, the outer edge of splint just in time with first fare groove parallel and level, also aligns with first fare groove in second fare groove, last eedle closes along the second fare line of rabbet joint can accomplish the work of dress waist. The utility model discloses operate very simply, even the workman of the any working experience of no one also can grasp fast, improved production efficiency, use the unified mould work of making in addition, can make production quality keep unanimous.