The invention discloses a switching device and a switching method, and belongs to the field of communication. The switching device is connected in series in the current circuit. The switching device comprises a capacitor bank, a detection circuit, a control circuit and a switching circuit, wherein the capacitor bank is electrically connected with the switching circuit, the switching circuit is electrically connected with the control circuit, the control circuit is electrically connected with the detection circuit, and the detection circuit is connected between two lines of the current circuit. The detection circuit detects the current circuit. The control circuit controls the switching circuit according to a detection result of the detection circuit. The switching circuit connects the capacitor bank in series in the current circuit or bypasses the capacitor bank according to the control of the control circuit. Switching of the capacitor bank is controlled through the current state of the detection circuit. Compared with the prior art, restrictions on the use of the circuit are avoided, the compatibility of the circuit is improved, and the cost of the circuit is reduced.