The quick adjusting clamp seat of the invention is equipped with a first arm plate and a second arm plate on a body, and the system is provided with at least two positioning notches which longitudinally penetrate the front and back sides of the body; the top of the first arm plate is provided with two first lugs which are respectively attached to the front and back sides of the body, and between the two first lugs is provided with a first notch which can span into any certain position of the body. The second arm plate is arranged at the other end of the body opposite to the positioning notch.If necessary, the relative position of the first and second arm plates can be adjusted by simply raising the first arm plate slightly, and then turning the first shaft rod into the positioning notch which is relatively close or far away from the second arm plate, so as to achieve the purpose of fast and accurate transformation of different sizes.本創作之快調式夾座,係在一本體上安裝有一第一臂板及一第二臂板,其本體係設有至少兩個縱向貫通其正、反兩面的定位凹口;第一臂板之頂部設有兩個供分別貼附於本體正、反面的第一凸耳,於兩個第一凸耳之間設置一可供對應跨入本體之任一定位凹口的第一軸桿;第二臂板則軸設於本體相對設有定位凹口的另一端。必要時,僅需將第一臂板略為上抬,再將第一軸桿轉而跨入相對距離第二臂板較近或較遠的定位凹口中,即可調整第一、第二臂板之相對位置,達到快速且準確變換不同使用尺寸之目的。