A method for supplying power to an active noise reduction headset, wherein the active noise reduction headset is connected to a terminal, and the method comprises: receiving, by the active noise reduction headset, a signal that is of first voltage and that is transmitted by the terminal; and processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of second voltage, wherein the second voltage is less than the first voltage, and the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset obtains the signal of the second voltage enabling it to implement a noise reduction function; wherein the receiving the signal that is of the first voltage and that is transmitted by the terminal comprises: receiving, by the active noise reduction headset by using a microphone cable of the active noise reduction headset, the signal of the first voltage transmitted by the terminal, characterized by wherein the processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of second voltage comprises: processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of third voltage, wherein the third voltage is less than the first voltage, and the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage; and processing, by the active noise reduction headset, the signal of the third voltage to obtain the signal of the second voltage, wherein the third voltage is greater than the second voltage. receiving, by the active noise reduction headset, a signal that is of first voltage and that is transmitted by the terminal; and processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of second voltage, wherein the second voltage is less than the first voltage, and the signal of the second voltage is transmitted to a noise reduction chip of the active noise reduction headset, so that the noise reduction chip of the active noise reduction headset obtains the signal of the second voltage enabling it to implement a noise reduction function; wherein the receiving the signal that is of the first voltage and that is transmitted by the terminal comprises: receiving, by the active noise reduction headset by using a microphone cable of the active noise reduction headset, the signal of the first voltage transmitted by the terminal, characterized by wherein the processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of second voltage comprises: processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of third voltage, wherein the third voltage is less than the first voltage, and the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage; and processing, by the active noise reduction headset, the signal of the third voltage to obtain the signal of the second voltage, wherein the third voltage is greater than the second voltage. processing, by the active noise reduction headset, the signal of the first voltage to obtain a signal of third voltage, wherein the third voltage is less than the first voltage, and the signal of the third voltage is transmitted to a rechargeable battery of the active noise reduction headset, so that the rechargeable battery stores the signal of the third voltage; and processing, by the active noise reduction headset, the signal of the third voltage to obtain the signal of the second voltage, wherein the third voltage is greater than the second voltage.