The cylinder is driven separately by 4 DC motors, which allows a wide range of speed adjustment. The rotation speed ratio of the 4 cylinders can be adjusted freely. The cylinders are equipped with preloading device and bearing lubrication failure alarm device, and there are also nip indicator and speed indicator. The cylinders are made of vanadium and titanium alloy chilled cast iron. The cylinder face is hard and wear-resistant. For heating or cooling, the cylinders are either circumferentially drilled or centrally drilled so that the temperature is well proportioned on the cylinder surface. The cylinders are arranged in S shape. The cylinder 1# and cylinder 4# have cylinder cambers, which can eliminate the bending effect on the cylinders during the working process. Thus, it is possible to make products with the same thickness in the axial direction. The transmission system adopts a hard-surfaced gear reducer with a compacted structure, which has higher transmission efficiency, lower noise and longer service life. The machine is equipped with an emergency device. When an emergency accident occurs, it will be stopped immediately to open the calendar cylinder area to protect the operator and equipment. PLC program controller is used in electrical systems.