The present disclosure provides a clamshell electronic device. The clamshell electronic device includes a touch module, a sensing device and a calculation unit. The touch module is arranged to detect touch events. The sensing device is arranged to detect whether an upper cover and a lower cover of the clamshell electronic device are separated, and produce a detecting signal when the upper cover and the lower cover are separated. The calculation unit is arranged to count the number of times the upper cover and the lower cover are separated according to the detecting signal to obtain a separated number, and calibrate the touch module when a predetermined condition is satisfied, wherein the predetermined condition comprises that the separated number is greater than a predetermined number.