The invention discloses a method for manufacturing a medical fixing brace. The method comprises the steps of using plastic film to cover a to-be-fixed part, then covering the surface of the plastic film with a gauze layer, coating the gauze layer with liquid plastic, coating the liquid plastic according to a grid structure, dividing a grid of an annular or cylindrical mesh structure into two sheets for coating, in the process of coating the liquid plastic, using ultraviolet rays to irradiate the liquid plastic while coating until the liquid plastic is solidified, drawing out the plastic film,and then using nylon hook and loop fasteners to connect the condensed plastic grid to the limb. The method for manufacturing the medical fixing brace has the advantages that the brace is simple in structure, convenient to use, good in breathability, firm and durable, has a good fixing effect, can completely fit the body surface of the human body, and can be quickly manufactured at the normal temperature.