The invention relates to a device and method for equal thickness interference presentation. The device includes a container with the top end provided with a circular opening. When the circular openingis sealed with a soap film, the pressure in the container can be adjusted, and when the pressure in the container is changed, the shape of the soap film can be changed. The device and method for equal thickness interference presentation can show an interference pattern of a Newton ring, and can also show a wedged interference pattern. In addition, the device can not only display an equal thickness interference pattern with the thin center and the thick periphery, but also can display an equal thickness interference pattern with the thick center and the thin edge.