Cabin entering method and device for foundation beam in ship refrigeration house

The invention discloses a cabin entering method and device for a foundation beam in a ship refrigeration house. The method comprises the steps that a portal frame hoisting assembly and a cantilever frame hoisting assembly are installed on the two sides of the top of an elevator trunk of a ship correspondingly; the foundation beam is transported to the position between the portal frame hoisting assembly and the cantilever frame hoisting assembly, and the two ends of the foundation beam are hooked correspondingly; the foundation beam is controlled to be horizontally and synchronously lifted upwards; when the lifting height of the foundation beam is equal to the length of the foundation beam, a hook of the portal frame hoisting assembly is controlled to move downwards, and then the foundation beam is controlled to steer; when the foundation beam turns to be vertically downward, the portal frame hoisting assembly is unhooked; the foundation beam is controlled to vertically move downwards along the elevator trunk,