The invention discloses a disposable laparoscopic soft instrument sheath device which relates to an endoscopic matching surgical instrument, which is used for gynecological pneumoperitoneum-free suspension laparoscopic surgery and small incision surgery, and is used for expanding incision field, protecting incision from injury and reducing incision infection. The device comprises an instrument introduction assembly, an intake and exhaust protector body, a locking mechanism and a cut-in sleeve. An instrument introduction sleeve device in that instrument introduction assembly comprise a fixing ring, an instrument introduction sleeve, a gas-blocking upper seal sleeve, a gas-blocking sleeve, a gas-blocking re, a gas-blocking lower seal sleeve and a connecting seat. The puncture sealing sleevedevice comprises a puncture sealing sleeve, a sealing gasket, a sealing fixing ring, a sealing gasket and a sealing connector. The intake and exhaust protector body comprises an intake valve, an exhaust valve, a connecting bottom pipe and an intake and exhaust ring body. The connecting and locking mechanism comprises a fixed ring body piece, an inner bayonet plate, an outer bayonet plate and a locking buckle. The cutout access sleeve comprises an access sleeve connector, an access sleeve outer ring, an access sleeve passage and an access sleeve insertion ring.