A kind of blood collecting pen structure, including a tube body, the pedestal of a socket what tube body, one slideably set the pulling piece that sliding seat in what pedestal, one movably install the Hou end of blood taking needle in what sliding seat, the body of a connection what pedestal and a setting what tube body. Before acquiring blood, blood taking needle is planted in what sliding seat, and the position by pulling piece to Hou drawing to drive retractable seat what to wait firing, most Hou presses press element and sends out blood taking needle with moment, so that blood taking needle is pierced into skin and then reaches the purpose for obtaining blood, and the degree that skin is pierced into when blood taking needle percussion can be controlled by the adjustment of body.一種採血筆結構，包括一管體、一套接於管體之座體、一可滑動地設於座體內之活動座、一可活動地安裝於活動座內之採血針、一連接於座體之套體，及一設置於管體之後端的拉引件。在採集血液前，將採血針插置於活動座上，並將拉引件向後拉以帶動活動座位於待擊發之位置，最後按下按壓元件以瞬間即發採血針，以使採血針刺入皮膚進而達到取得血液之目的，並且可藉由套體之調整來控制採血針擊發時刺入皮膚之程度。
