The invention provides a trouser seam clamp structure of a novel hand-held garment ironing machine, which includes an auxiliary steam outlet for ironing trouser seams, a trouser splint for pressing clothes, and a trouser splint arranged in the hand-held garment ironing machine. Steam generator and main steam outlet. The auxiliary steam outlet includes a vaporization cover, a trousers pipe joint with an inner hole, a sealing plug with an inner hole, and an upper cover of the garment steamer; the trouser splint includes a rotating shaft bracket, a rotating shaft, a torsion spring for providing torsion, and Compress and fix the pressing plate of the clothes; the invention adopts the independent auxiliary steam port design, and its steam channel has a good airtight and stable structure, combined with the trouser seam clip structure designed integrally with the garment ironing machine, the structure is simple and practical , safety, the invention ensures the ironing effect of the trouser seam, improves the portability and ironing efficiency of the hand-held garment ironing machine, and solves the problem that it is difficult for the general hand-held garment garment ironing machine to iron the straight trouser seam.