A foldable electric fan, including a pressing-down part, a limiting base and a sliding pressing plate for restriction is provided. By pushing one end of the sliding pressing plate for restriction to extend and penetrate through the locking-through channel, the pressing plate for restriction is on top of the movable front supporting base, the fixed supporting base and the movable rear supporting base at the same time. Then when the pressing-down part is exerting pressure on the sliding pressing plate for restriction, the pressing plate for restriction is able to press on the movable front supporting base, the fixed left and right supporting base and the movable rear supporting base at the same time in order to enable the sliding pressing plate for restriction to press tightly on the base, which is easy for operation, simple in structure and not easy to produce scattered components. At the same time, the turnover mechanism further reduces the occupied space of the foldable electric fan.