A spiral trocar with pneumoperitoneum device comprises at the proximal end a cannula sheath (2) having a handle (1) and a core shaft (4) having a core shaft seat (3). The core shaft (4) is a hollow tube having at its distal tip an aperture (31) provided within the cavity of the core shaft (4) and extending from the distal to the proximal end of the core shaft (4) are, in order, a pneumoperitoneum needle (12) having a reset device, and an air tube (13) the tip of the pneumoperitoneum needle (12) extends outside the core shaft (4) through the aperture (31) the air tube (13) is sleeved on to the proximal end of the pneumoperitoneum needle (12) one end of the reset device is connected to the fluid-conveying tube (13) and is also fixed to the inside wall of core shaft (4), the other end of the reset device being fixed to the pneumoperitoneum needle (12) when the cannula sheath (2) having a handle (1) and the core shaft (4) having a core shaft seat (3) are assembled and the distal end of the core shaft (4) extends completely out of the cannula sheath (2), an air hole (14) is provided on the side wall of the core shaft (4) under a rubber one-way valve (7), and the opening at the top end of the fluid-conveying tube (13) does not adjoin the inner wall of core shaft seat (3). Operation is simple and risks of surgery are reduced.Linvention concerne un trocart en spirale muni dun dispositif pour pneumopéritoine qui comprend à lextrémité proximale une gaine de canule (2) munie dun manche (1) et un arbre central (4) comportant une assise darbre central (3). Larbre central (4) est un tube creux comportant une ouverture (31) à son extrémité distale. Dans la cavité de larbre central (4) et salignant de lextrémité distale vers lextrémité proximale de larbre central (4), se trouvent, dans lordre, une aiguille à pneumopéritoine (12) munie dun dispositif de réarmement, et un tube à air (13). La pointe de laiguille à pneumopéritoine (12) se prolonge vers lextérieur de larbre central (4)
