This utility model relates to the field of leg orthosis technology and discloses a leg orthosis with a tension adjustment mechanism. It includes a lower orthosis body and an upper orthosis body, with the upper orthosis body located above the lower orthosis body. A flexibly rotating adjustment component is provided between the upper and lower orthosis bodies. The adjustment component includes a disc, and external pads are vertically fixed to the front ends of both sides of the upper and lower orthosis bodies. This leg orthosis with a tension adjustment mechanism achieves mechanical adjustment of the tension of the orthosis belt by incorporating a corrective belt, a disc, a linkage shaft, a connecting seat, and external pads. It eliminates the need for manual operation, is highly practical, and prevents the corrective belt from falling off. It solves the problem that leg orthosis primarily relies on manual adjustment, which is inconvenient for
continuous use during exercise due to its complex operation, limited traction and pressure effects, and reduced efficiency.