A kind of accessory tightening structure includes at least an assistive device body and the two of position what assistive device body both ends and folds plate. It is folded aforementioned two and is respectively equipped with a parallel opposite rolling rod on plate, and one binding yarn be wrapped on two rolling rods, and allow binding yarn one end is freely exposed to operate for user, thereby the scaling operation of binding yarn enables two to fold plate close to or far from reaching tightening or loosen the purpose of accessory tightening structure.一種輔具束緊結構至少包含一輔具本體與位於輔具本體兩端的二收合板。在前述二收合板上分別設有平行相對的一滾動桿，且一束繩纏繞在二滾動桿上，並讓束繩一端自由外露供使用者操作，藉此束繩的伸縮操作令二收合板靠近或遠離，達成收緊或放鬆輔具束緊結構之目的。
