Hepatobiliary surgery traction device capable of conveniently adjusting size of opening

The invention discloses a hepatobiliary surgery traction device capable of conveniently adjusting the size of an opening. The hepatobiliary surgery traction device comprises adjustable fixing devices,a cover ring assembly and a traction assembly, wherein the cover ring assembly comprises a surgery cover cloth and a fixing ring, an elastic opening is formed in the surgery cover cloth, the fixing ring comprises an upper fixing ring and a lower fixing ring, a connecting ring module assembly is arranged on the inner ring surface of the upper fixing ring, the four adjustable fixing devices detachably and fixedly connected with the edge of a surgery bed are arranged on the bottom surface, close to the outer side, of the upper fixing ring, and a plurality of adjustable drag hook structures capable of automatically adjusting the distance and the position are arranged between the inner wall and the outer wall of the lower fixing ring. According to the surgery traction device, an automatic mechanical structure and voic