Abstract: An ultra-thin keyboard switch includes a base, a static contact plate, a support plate, a movable contact plate, a lower frame, an upper frame, and a keyboard cap. The static contact plate and the support plate are separated from each other and disposed on the base. The upper frame and the lower frame are intersected and pivotally connected with each other to form an X-shaped configuration to bring the movable contact plate to move. The thickness of the product can be reduced to be thin. No matter where the user's finger is at any position of the keyboard, the upper frame and the lower frame are linked to bring the movable contact plate to move. The present invention can be pressed stably, so that the connection of the static contact plate and the movable contact plate is more sensitive and the product can be used more conveniently.