A suture cut-off structure for subcutaneous stitching operation includes a forceps and a cutter blade arranged at one end of the forceps. The cutter blade has an end forming two rims, which correspond to each other and have the same length. Each rim has a contour forming a curve section. The rims define therebetween a cutting trough in which a cutting edge is formed. The suture is receivable into the cutting trough to allow the suture to be cut off through a forward movement of the cutting edge. With the rims being positionable on and depressing down patients skin, cutting of the suture and at the same time depressing down the patients skin can be simultaneously done with a single hand The cutting edge is located inside the cutting trough of the rims and is thus isolated so that undesirably hurting the patients skin can be avoided.
