A laminating device for laminating at least one flexible substrate includes a frame, a pressing module, a driving module, a pressure sensor and a control module. The pressing module is disposed on the frame. The pressing module at least includes a first roller and a second roller which are used for moving relative to each other. The driving module is connected to the first roller for driving the first roller. The pressure sensor is disposed on one side of the second roller and opposite to the first roller for detecting a pressure of the pressing module. The control module is electronically connected to the pressure sensor and the driving module for ordering the driving module to adjust the position of the first roller based on the difference between the pressure detected by the pressure sensor and a predetermined pressure.