A window manufacturing system includes a first processing unit in which a process of providing a dummy substrate on a stage is performed, a second processing unit in which a process of providing a dummy adhesive layer on the dummy substrate is performed, a third processing unit in which a process of providing a window layer on the dummy adhesive layer is performed, and a fourth processing unit in which a process of providing a protective cover on the window layer is performed. The fourth processing unit includes a pressurization unit which presses the protective cover to the window layer.