The invention discloses an impedance-adjustable receiver comprising a casing, a driving device, a sounding unit and a circuit board. The driving device comprises an electromagnetic driving device and a coil. The impedance-adjustable receiver further comprises an adjustable resistance unit which is fixedly connected to the casing. The adjustable resistance unit comprises at least two pins and an adjustment lever connected with the pins in a conducting manner. One of the pins is a first pin with the minimum impedance, the first pin is electrically connected with the circuit board and used for inputting electric signals to the circuit board, and the circuit board is electrically connected with the coil and used for inputting the electric signals to the coil and receiving feedback signals from the coil. The impedance can be freely adjusted, and the using requirement of different users for impedance can be met by only one device.