The invention relates to a machine tool used for mounting a sealing film and belongs to the field of assembly equipment in the packaging technology. The machine tool comprises an assembly line, a rubber roller, a glue bucket, a roller, a belt and a feeding hopper, wherein the rubber roller and the roller are arranged above the assembly line oppositely, a gap is reserved between the rubber roller and the roller, the glue outlet end of the glue bucket is arranged above the rubber roller, the belt is wound around the outer surface of the roller, the feeding hopper is arranged above the belt, the sealing film is placed on the assembly line, and a mold is placed on the belt. According to the machine tool used for mounting the sealing film, film mounting is accurate, the error rate of film mounting is reduced, and the storage effect of the mold is improved.