This creation provides a decompression assistive device for lower limbs with a changeable angle, which includes a first member, a second member, and a rotating member. The first member includes a first bottom, two first brackets respectively erected on opposite sides of the first bottom, and a first strap spanning each of the first brackets. The second member includes a second bottom, two second brackets respectively standing on opposite sides of the second bottom, and a second strap spanning each of the second brackets, the first bracket The frame partially overlaps with the second bracket, and there is a gap between the first bottom and the second bottom. The rotating member includes a rotating wheel pivoted at the overlap of the first bracket and the second bracket, and an operatively restricting the rotating wheel and controlling the overlapping angle of the first bracket and the second bracket The restrictions.本創作提供一種可變換角度之減壓下肢輔具，包含有一第一構件、一第二構件、以及一轉動構件。該第一構件包含有一第一底部，二分別立設於該第一底部相對兩側之第一托架，以及一跨設於每一該第一托架之第一繫帶。該第二構件包含有一第二底部，二分別立設於該第二底部相對兩側之第二托架，以及一跨設於每一該第二托架之第二繫帶，該第一托架與該第二托架部分重疊，該第一底部與該第二底部之間留有一餘隙。該轉動構件包含有一樞設於該第一托架與該第二托架重疊處之轉動輪，以及一可操作地限制該轉動輪並控制該第一托架與該第二托架交疊夾角之限制件。
