A working casing pipe for minimally invasive surgery comprises a sheath (2), a silicone casing pipe (6), a multi-channel cap (9), and a multi-channel leather packing (11). The multi-channel cap (9) and the multi-channel leather packing (11) can be used for letting multiple apparatus channels (8) pass through. Openings used for letting carbon dioxide channels (7) pass through are disposed on the multi-channel cap (9) and the multi-channel leather packing (11). Multiple tracks (10) are disposed on the multi-channel cap to let the apparatus channels (8) move left and right. Further, an air injection hole (14) or a valve is disposed in the multi-channel cap (9) to fill gas into a gasbag (15) at the lower end of the silicone casing pipe (6). The multi-channel leather packing (11) is corrugation-shaped, and the cross section may be V or u-shaped. The sheath (2) and the silicone casing pipe (6) are jogged together to form the middle part with mixed hard and soft materials, of the working casing pipe. A penetrating channel (5) is disposed at the tail of the sheath (2) to let a penetrating knife pass through, and an angle is formed between the tail of the sheath (2) and the middle part of the sheath (2). The working casing pipe provides the possibility of direct penetration, enough support force and large operating space, and provides the operation flexibility, an anti-gas leakage function and an anti-separation function, thereby removing the restriction of the existing working casing pipe on types and methods of the minimally invasive surgery and meeting requirements in complicated minimally invasive surgery.Linvention concerne un tube enveloppe de travail pour chirurgie mini-invasive qui comprend une gaine (2), un tube enveloppe de silicone (6), un bouchon multi-canal (9), et un emballage en cuir multi-canal (11). Le bouchon multi-canal (9) et lemballage en cuir multi-canal (11) peuvent être utilisés pour laisser passer des canaux multiples (8) de lappareil. Des ouvertures
