The invention relates to a joint angle adjusting mechanism, which comprises a base, two connectors and a certain position mechanism.The base is provided with a center and two opposite side plates, which define an axial direction. At least one side plate is provided with a plurality of tooth recesses which are arc-shaped and connected with respect to the center recesses, and the openings of each tooth recesses are toward the center.The two connectors are respectively connected to the base, and at least one of the two connectors is pivoted to the base.The positioning mechanism includes at least one adjusting mechanism.The adjustment mechanism is pivoted on the base with the center as the axial direction.Each adjusting mechanism includes a certain position component.The positioning assembly includes a sliding seat,A fixed position piece and an elastic reed,The locating member is slidably arranged in the sliding seat and can selectively move radially to engage or separate from a tooth concave.The elastic reed is arranged in the sliding seat and the two ends of the elastic reed are curled and flexed relatively inward.The elastic reed is spring against the locating piece.Furthermore, the locating part has the trend of radially facing the tooth concave.本創作關於一種關節角度調整機構，其包括一基座、二連接件及一定位機構。該基座具有一中心及二相對之側板，該中心定義一軸向，至少一該側板相對於該中心凹設有弧形配置且相連通之複數齒凹，各該齒凹之開口係朝向該中心。該二連接件分別連接於該基座，該二連接件至少其中一者係樞接於該基座。該定位機構包括至少一調整機構，各該調整機構係以該中心為軸向樞設於該基座，各該調整機構包括一定位組件，該定位組件包括一滑座、一定位件及一彈性簧片，該定位件係滑設於該滑座內且可選擇性地徑向移動而與一該齒凹相嵌卡或相脫離，該彈性簧片係設於該滑座內且該彈性簧片之兩端係相對朝內捲曲撓折，該彈性簧片係彈抵於該定位件，進而使該定位件具有徑向朝向一該齒凹嵌卡之趨勢。
