The invention relates to the medical field, and more particularly to a preparation device for a medical bandage for gynecology. The medical bandages with different thicknesses can be cut; the cuttingamplitude can be changed at the same time; the cutting speed can be adjusted by a shifting combination body, the preparation device includes a chassis assembly, a carrying device, a joint combinationbody, a shifting assembly, an input motor 3 and an output straight teeth, the preparation device drives a stitching rod 1 and a stitching rod 2 to carry the medical bandage which needs to be cut off,manually rotates a manual adjusting rod 1 , and an inner end sliding rod is driven to rotate by the manual adjusting rod 1, an inner end sliding boss and an outer wall sliding groove are cooperated and connected to drive a middle end rotating rod to rotate, and the middle end rotating rod drives a tooth bar to rotate. Through the joint connection of a hinged boss and a connecting waist groove, a traverse strut is driven to slide to drive a connecting rod 1 and a connecting rod 2 to slide in a driving waist groove respectively, and the carrying amplitude of the stitching rod 1 and the stitchingrod 2 can be changed.