The multi-section spring tube assembly of an endoscope of the present invention is used to connect a lens assembly and a control box, and includes a first connector, a first spring tube, a second connector, a second spring tube, and a supporting steel cable. The first connector connects the lens assembly and the first spring tube, the second connector connects the first and the second spring tube, and the second spring tube connects the control box； the support cable is divided into a first section of cable and A second section of steel cable, one end of the first section of the cable is fixed to the first connector, the other end passes through the outer side of the second connector and is connected to the second section of cable, a large diameter portion is formed at the connection to resist the The second connecting piece, the other end of the second section of steel cable is fixedly connected to the control box.本發明一種內視鏡之多段式彈簧管總成，用以連接鏡頭組件與控制盒，其包括:第一連接件、第一彈簧管、第二連接件、第二彈簧管以及支撐鋼索，該第一連接件連結該鏡頭組件與該第一彈簧管，該第二連接件連結該第一與該第二彈簧管，該第二彈簧管連結該控制盒；該支撐鋼索分成第一段鋼索與第二段鋼索，該第一段鋼索一端固接該第一連接件、另一端穿過該第二連接件外側並與該第二段鋼索連接，在連接處形成一大徑部可抵著該第二連接件，該第二段鋼索另一端固接該控制盒。
