In the present invention, in a wedge mechanism for fixing a CFRP plate applied for reinforcing a structure: a fixing unit 20 for supporting the CFRP plate 25 in a tensioned state is mounted on one side of the structure, and a CFRP plate material on the fixing unit 20 A wedge piece 30 for applying frictional force due to acupressure stress to (25) is mounted, and the wedge piece 30 is characterized in that it has a curved surface convexly curved at the upper surface portion 31. Accordingly, in the process of reinforcing a structure using a CFRP plate, there is an effect of uniformly maintaining the acupressure stress applied to a specific part of the wedge to maintain the functionality of the tension while improving durability by preventing damage.
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