The present invention is an improved structure of a multi-functional lens cannula, which is mainly designed for an improved endoscope lens tube, which can be easily fixed and combined with a lens unit and a camera module, a working tube, a light source module or an optical fiber. Such components, which are easy to manufacture and assemble, and save the overall space, are characterized by a lens casing designed as an integral structure, which is provided with a working tube coupling hole and a lens group coupling hole, a light source coupling hole, and an image module. By combining the holes and the like, it is possible to provide a simple and stable combination with each of the modules and components, and then complete the combined structure of the endoscope mirror lens device by sealing, and has improved practicality.本創作為一種多功能鏡頭套管改良結構，主要針對內視鏡鏡頭套管加以改良設計，使其可簡易的固定結合鏡頭裝置之鏡片組及攝像模組、工作管、和光源模組或光纖等構件，獲致製造及組裝的簡便性，並節省整體空間者，其特徵在於設計以一體結構的鏡頭套管，其內部設有工作管結合孔和鏡片組結合孔，光源結合孔，影像模組結合孔等，可提供分別與各該模組及構件簡易的穩固組合，再經封膠即完成內視鏡鏡鏡頭裝置之組合構造，而具備進步實用性者。
