An electrocautery instrument for medical treatment comprises: a main body, having a shaft portion disposed along an axial direction of the main body a control structure, disposed on the main body and including a stretchable element being stretchable in the shaft portion in the axial direction and an electrocautery module, including a rotatable portion and an electrocautery rod inserted in the rotatable portion. The rotatable portion includes a rotatable shaft being rotatably, axially, and correspondingly connected to the shaft portion. The rotatable shaft includes a surrounding contact face which is in a polygonal shape with multiple sides. The stretchable element elastically makes contact with any of the multiple sides of the surrounding contact face to position the electrocauteiy rod. Therefore, the present invention provides a pause hand feeling for location, so that a user knows an accurate rotation angle of the electrocautery rod.一種醫療用電燒器,包括:一本體,具有沿本體軸向設置的軸接部;設置於本體的一控制結構,包含能在軸接部徑向彈性伸縮的伸縮件;以及一電燒模組,包含轉體和插接於轉體的電燒桿,轉體具有可旋轉地對應軸接於軸接部的轉軸,轉軸具有環繞接觸面,環繞接觸面為由多數邊組成而呈多邊形,伸縮件彈性抵接於環繞接觸面之各邊中的任一邊而定位電燒桿。藉此,以在撥轉電燒桿時具有頓挫定位手感,進而讓施力者清楚知道電燒桿準確的轉動角度。1‧‧‧本體11‧‧‧軸接部2‧‧‧控制結構21‧‧‧伸縮件211‧‧‧固接端212‧‧‧抵接端22‧‧‧中空筒223‧‧‧卡扣體23‧‧‧拉帽3‧‧‧電燒模組31‧‧‧電燒桿32‧‧‧轉體321‧‧‧轉軸3212‧‧‧環繞接觸面
