The utility model relates to a prevention perpendicular foot auxiliary device, which is suitable for wearing on the foot to fix the angle of the ankle joint. The prevention perpendicular foot auxiliary device comprises a bracket and a covering part.The scaffold includes a sole support part, a leg support part and an ankle support part which is connected between the sole support part and the leg support part and is roughly in a right angle bending shape. The ankle support part can adjust the bending angle under stress.The covering part includes a covering body which is hollow in the interior to hold the scaffold, the covering body has a covering part of the palm of the foot which holds the scaffold, a covering part of the leg which holds the scaffold of the leg, and an covering part of the ankle which holds the scaffold of the foot, the covering part also includes a fixing unit of the palm of the foot which is used to fix the covering body on the foot and a fixing single of the leg And an ankle fixation unit.一種預防垂足輔具，適用於穿戴在足部以固定足踝關節之角度，該預防垂足輔具是包含一支架，及一包覆件。該支架包括一腳掌支架部、一小腿支架部，及一連接於該腳掌支架部及該小腿支架部間且大致呈直角彎折狀的足踝支架部，該足踝支架部可受力地調整彎折角度。該包覆件包括一內部呈中空以容置該支架的包覆本體，該包覆本體具有一容置該腳掌支架部的腳掌包覆部、一容置該小腿支架部的小腿包覆部，以及一容置該足踝支架部的足踝包覆部，該包覆件還包括用以使該包覆本體固定於足部的一腳掌固定單元、一小腿固定單元，及一足踝固定單元。
