A double-lock cylinder mutual control and decoding method for a lock, comprising: firstly decode a password of a first lock cylinder (111, 24, 322, 52), wherein before the password of the first lock cylinder (111, 24, 322, 52) is decoded, the first lock cylinder (111, 24, 322, 52) limits the decoding of a password of a second lock cylinder (121, 23, 321, 53), while the second lock cylinder (121, 23, 321, 53) limits the rotation of the first lock cylinder (111, 24, 322, 52); after the password of the first lock cylinder (111, 24, 322, 52) is decoded, the first lock cylinder (111, 24, 322, 52) can move from a first position to a second position by utilizing a pre-set position difference, but cannot rotate; when the first lock cylinder (111, 24, 322, 52) moves in place, release the limitation on the password decoding of the second lock cylinder (121, 23, 321, 53), but the second lock cylinder (121, 23, 321, 53) still limits the rotation of the first lock cylinder (111, 24, 322, 52); and then decode the password of the second lock cylinder (121, 23, 321, 53), and after the password of the second lock cylinder (121, 23, 321, 53) is decoded, the first lock cylinder (111, 24, 322, 52) and the second lock cylinder (121, 23, 321, 53) can rotate together, thereby realizing the unlocking. The present invention also relates to a double-cylinder mutual control lock.
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