The proportional valve including a valve body, an air inlet hole and an air outlet hole being provided inside the valve body a valve core component, the valve core component being movably disposed inside the valve body along a vertical direction and a first film sheet, an outer side of the first film sheet being connected to the valve body, and an inner side of the film sheet being connected to the valve core component. The proportional valve has a high response speed, high precision, desirable repeatability, desirable consistency, small hysteresis, low fabrication difficulty, and low fabrication cost.
