An electronic device is provided. The electronic device includes a frame, a sliding seat, and a receiver accommodated in the sliding seat. The frame includes a pair of side walls oppositely disposed and a top wall. The top wall defines an accommodating groove. The accommodating groove extends through the pair of side walls. The sliding seat is slidably disposed in the accommodating groove of the frame. The sliding seat defines a first receiving hole, and the receiver is sealed and covers the first receiving hole of the sliding seat, whereby a sound signal of the receiver is transmitted to outside through the first receiving hole when the sliding seat extends from the accommodating groove. In addition, a terminal device and a method for controlling an electronic device are provided.