The invention provides a sliding key, a control device of the sliding key and a control method of the sliding key. The sliding key comprises a panel, a PCB and at least two induction electrodes, wherein a sliding area is arranged on the panel, the PCB and the sliding area on the panel are correspondingly arranged, a sliding key control device is arranged on the PCB, the induction electrodes are arranged between the sliding area on the panel and the PCB, and the induction electrodes are electrically connected with the sliding key control device. According to the sliding key, the control device of the sliding key and the control method of the sliding key, whether the sliding operation is carried out on the sliding key or not, the direction of the sliding operation and the number of the slide keys of the sliding operation are judged through comparison of detection results of key states at two times, therefore, the sliding key is controlled to conduct corresponding gear adjustment, various adjustment requirements of a user can be met, and friendliness of an operation interface is improved.