A fixing mechanism for a closed distal femur osteotomy according to an exemplary embodiment of the present invention is installed on a femur incised by the closed distal femur osteotomy, and the fixing mechanism includes: a body portion which is in close contact with the femur and has a plurality of coupling holes and an oblong hole； a head portion which is connected to one end of the body portion and has a plurality of coupling holes； screws which are inserted into the coupling holes； and a sliding screw which is inserted into the oblong hole by adjusting a coupling position, in which the head portion has a predetermined inclination angle in an upward direction based on a lower surface of the head portion.
