An angle adjusting mechanism of hole-drilling positioning assistant device for dental implant comprises: a first adjusting rod a second adjusting rod having an annular clamp part which is sleeved onto the first inner end part of the first adjusting rod, and the second rod body of the second adjusting rod having an external thread part and a fixing ring provided with an inner thread part which can be adjusted to screw on the external thread part of the second adjusting rod, and the fixing ring can be adjusted to cover the annular clamp part. By adjusting the whole length of the first adjusting rod and the second adjusting rod, the position and angle of the drill guiding part can be relatively adjusted. Moreover, the angle adjusting mechanism and fixing ring are axially arranged, so there will be no room for loosening and the straight space of the hole-drilling positioning assistant device will not be occupied.一種人工植牙之鑽孔定位輔助器之角度調整機構包含有:一第一調整桿;一第二調整桿,具有一環形夾口部,其夾套於第一調整桿的第一內端部,第二調整桿的第二桿體並具有一外螺紋部;以及一固定環,設有一內螺紋部,其可調整地螺合於第二調整桿的外螺紋部,且固定環可調整地套覆環形夾口部。依調整第一調整桿及第二調整桿的整體長度,而相對地調整鑽頭導引部的位置及角度,而且角度調整機構及其固定環係軸向設置,不虞鬆脫,且不會佔據鑽孔定位輔助器的直向空間。100‧‧‧主臂單元110‧‧‧第一端部120‧‧‧第二端部130‧‧‧臂體200‧‧‧延伸臂單元210‧‧‧第一連結頭220‧‧‧第一連桿230‧‧‧第二連桿240‧‧‧第二連結頭241‧‧‧外端部251‧‧‧第一梢體252‧‧‧第二梢體253‧‧‧第三梢體254‧‧‧第四梢體260‧‧‧鑽頭導引部300‧‧‧角度調整機構310‧‧‧第一調整桿320‧‧‧第二調整桿330‧‧‧固定環400‧‧‧基準軸500‧‧‧連結軸
