The invention discloses a flexible fixing device for orthopedics, which belongs to the technical field of orthopedic medicinal apparatuses and elastically fixing orthopedic injuries. The invention adopts the technical scheme that: the device consists of a screw, a nut, a fastening rope and a baffle plate, wherein the front end of the screw is sharp, while the rear end is connected with one end of the fastening rope, and the other end of the fastening rope is connected with the baffle plate; and the diameter of the screw is 3 to 5 millimeters, the nut is matched with the screw, the middle part of the screw is provided with breaking grooves which are continuous grooves surrounding the screw, and the bottoms of the grooves are acute-angled. When the device is adopted, the screw for screwing the nut and the baffle plate are placed on two sides of an inferior tibiofibular joint or an acromioclavicular joint to be fixed, and the middle of the joint is tensioned by the fastening rope to perform flexible fixation. Compared with the traditional rigid fixation, the device has the advantages of low wound, low injury to soft tissues, short operation time, capability of relieving the influence of anesthesia on a patient, short recovery time after the operation, reduction of medicinal load of the patient and the society, simple and convenient operation and convenient popularization.