The invention provides a pure copper ammonia fiber high-density imitated silk jacquard plus material and a preparing method of the pure copper ammonia fiber high-density imitated silk jacquard plus material. Warp yarns of the plus materials are copper ammonia 75D / 45F, weft yarns are copper ammonia 75D / 54F, the warp yarn density is 750 to 787 / 10cm, the weft yarn density is 630 to 709 / 10cm, the breadth is 250 to 340cm, the plus material is jacquard fabrics, the pattern width is 60 to 64cm, and the length is 90 to 100cm. The plus material is woven by a single weaving shaft of a rapier loom, the luster, the drapability, the ventilation performance and the hand feeling of the plus material are very similar to those of real silk, the breadth of the plus material is greater, in addition, the quality of the plus material on the whole breadth is identical, and front and back side defect spots do not exist.