The invention provides a mobile data locking device for providing mobile data in mobile terminal with non-volatile data back-up, including: locking host machine and a plurality of locking adapter, each said locking device includes private interface which meets different standard mobile terminal and is used in switching to the said mobile terminal which is with different type interface. In which, locking adapter includes: first locking private interface; the said locking host machine includes: second locking private interface for making electrical interface and/or data interface with a corresponding first locking private interface; storage unit for storing system software program code, simultaneously, providing the said mobile data with non-volatile storage. One can back up his mobile data in the mobile phone terminal easily and effectively without computer by the mobile data-locking device provided by the invention.

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