A method, system, and unlocking device for device unlocking and a device to be unlocked. The method comprises: when unlocking a device to be unlocked, an unlocking device verifies whether a current user is a valid user, if the current user is a valid user, acquires an audio password signal, and transmits the audio password signal to the device to be unlocked via a high-frequency audio band; the device to be unlocked receives the audio password signal via the high-frequency audio band, parses the audio password signal, acquires an unlocking parameter carried by the audio password signal, verifies the unlocking parameter, and unlocks upon successful verification.
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