A device for manufacturing double-faced corrugated paperboards is provided, which exerts uniform pressure and enlarge the heated area during the adhesion of a single-faced corrugated paperboard and a liner into a double-faced corrugated paperboard. The device mainly contains a number of flexible, strip-shaped, pressurizing members arranged in parallel along the advancing direction of the paperboard, each of which is suspended by two ore more lifting members which can lower the pressurizing member down to the paperboard and lift the pressurizing member up from the paperboard.