The present invention relates to a liver opening device used in a laparoscopic gastric operation. The present invention is characterized in that the liver open device includes an elastic lining ring (1), a soft sleeve (2) and an elastic tongue ring (4). The circumstance of the elastic lining ring (1) is respectively connected with the soft sleeve (2) and the elastic tongue ring (4). The other end of the soft sleeve (2) is under the open status. The liver opening device used for the laparoscopic gastric operation provided by the present invention has the advantages of simple and reasonable structure, convenient use and low cost. The device can rapidly seal the incision, reconstruct the pneumoperitoneum, fully open the lever under the pneumoperitoneum status and effectively expose small bend visual fields. A large outer-arranged surgical instrument can be arranged through the device and the internal and external linkages in the peritoneal under the pneumoperitoneum status can be done to finish the gastric operation.