Upper box structure of laminating machine and laminating machine

In the prior art, when the size of an upper cover is increased, the upper cover is deformed, good sealing cannot be realized, and when the size of the upper cover is reduced, the inner pressure and the outer pressure of a lower cavity are not balanced because the size of the upper cover is reduced and enough gravity does not exist under the action of the inner pressure of the lower cavity. The utility model relates to a laminating machine, in particular to an upper box structure of a laminating machine and the laminating machine, and aims to solve the problem that when an upper cavity of a silica gel plate type laminating machine in the prior art is filled with compressed gas, the air pressure in the upper cavity is greater than the external atmospheric pressure. The upper box structure of the laminating machine comprises an upper box and a laminating unit upper part consisting of an upper cover, a silicon cavity plate and a flange frame, the silica gel plate is fixedly arranged at the lower opening of the up