Lock in lock structure suitable for safe case

The utility model relates to a lock-in-lock structure suitable to be used in a safe cabinet, belonging to the technical field of security equipment of the safe cabinet. A link rod (3) is arranged on the inner side of a cabinet door (1) and fixed on the inner side of the cabinet door via a link mechanism fixing pin (2), a bolt (6) is arranged on one end the link rod, the middle part of the bolt is limited on the inner side of the cabinet door by a bolt positioning piece (8), a magnet (10) is arranged on the lower part of the bolt in the corresponding position, and a shifting rod of a main lock shifting piece (5) passes into a sliding chute (4) of the link rod; and a coded lock locking piece (14), a bolt contact piece (9) and a middle interlock plate (11) are sequentially arranged on the inner side of a connecting rod (13) from top to bottom, a plurality of lock cylinders (12) are arranged on the outer side of the connecting rod, and a coded lock shifting piece (7) is arranged on the other side of the coded loc