The invention discloses an interactive method, an interactive device and an interactive system for a key. The method comprises the steps that user equipment (UE) receives the key sent by a far-end server; the UE establishes a near field communication (NFC) channel with service processing equipment when the received key is required to be used; and the UE transmits the received key to the service processing equipment through the established NFC channel. According to the method, the device and the system, a user is not required to manually look up the key or present the key to a key certification party when the key is used, so that the interactive operation of the key is convenient and quick, and user experience is improved.