The membrane switch adopts a unitary sealing structure composed of multi-layers, and is a novel electronic component integrating light, machine, and electricity which seals the button switch, the panel, the mark, the symbol display, and the lining plate together. It has advanced waterproof, dustproof, oil proof, anti-harmful gas erosion performance. It is stable and reliable, lightweight, small-sized, durable, and convenient for assembly. The panel can be washed without printing damaged. It is also colourful, attractive, and magnificent.