Knee joint fixing support

The invention belongs to the field of protection of knee joints and particularly relates to a knee joint fixing support. The knee joint fixing support comprises a thigh mechanism and a shank mechanism, wherein the thigh mechanism is hinged to the shank mechanism. According to the knee joint fixing support, an injured knee joint can be drawn apart at a certain gap through turning a screw sleeve ona cylinder, and muscle of a corresponding leg is tightened through a leg band doing axial movement relative to an ejector pin while fixing, so that when a person equipped with the knee joint fixing support descends stairs or is pushed and shoved carelessly, the leg where the injured knee joint is located cannot suffer from that the knee joint bears relatively high stress instantly due to empty pedaling, the injured knee joint is protected from secondary injury, and meanwhile, the knee joint fixing support can be effectively and continuously fixed to the leg and continuously and effectively plays a role in supporting t