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This invention belongs to the field of medical suture technology, and particularly relates to a medical suture barb heat-fusion device, comprising a first traction component, a second traction component, a positioning component, a heat-fusion component, and a cutting component. The first and second traction components are used to drive the suture to linear horizontal movement and rotation from both ends. The positioning component provides effective positioning support for the linearly horizontally moving suture. The heat-fusion component softens the suture to a suitable degree. The cutting component cuts barbs on the softened suture. This invention has a simple structure, is easy to operate, and has low maintenance costs.