The present invention pertains to a method of manufacturing ultra-thin and elastic keypad, especially comprising the processing of the elastic film, silicone adhesive, and plastic film. Wherein, the present method simply takes advantage of the steps of printing, oil pressing, and trimming to easily finish the keypad, which favorably avoids the complex process of spraying P+R, deviation from the forming of IMD products, and defectiveness of spraying and cutting applied on silicone products. Manifestly, the present invention simplifies the intricate processes, and only oil-pressing die and punching die are involved, namely less equipment and fewer personnel as well as places are required. Therefore, the present invention is uncomplicated and low-cost.