A medical fixing brace, which is characterized in that it is a mesh-shaped plate provided with several large ventilation openings and injection molded from a shape memory material. On both the front and rear surfaces of each side of the mesh plate in proximity to the transverse edges, several mounting holes used for connecting an engaging fitting apparatus are provided symmetrically along the plate-shape structure, or several mounting holes for connecting an engaging fitting are provided on at least one surface. The thickness of the mesh-shaped plate are thinned at the mounting holes; and, provided within the mounting holes are some parts for mounting the engaging fitting apparatus. The fixing brace has no coating layer, allows with the large hole structure thereof the direct viewing of condition changes, and prevents the occurrence of post-traumatic complications; clamping tightness can be adjusted throughout a treatment, compression on soft tissues is maintained, and fixing effects are great; the fixing brace can be used on either the left or right, operation is simple for a physician. The material used for the fixing brace is nonabsorbent and has no padding structure, dries quickly after shower, provides great comfort, prevents the occurrence of itchiness and dermatitis. This is applicable in externally fixing body parts such as the upper limb, the neck, the chest, the waist, and the lower limb.