Unlocking method and system of dynamic coded lock, and dynamic coded lock circuit

The invention relates to an unlocking method and system of a dynamic password lock, and a dynamic password lock circuit. The unlocking method comprises the following steps that: a server responds to an unlocking request of a user, and an unlocking parameter is encrypted through an encryption key to generate a dynamic password; and the user inputs a dynamic password, the dynamic password lock decrypts the dynamic password to obtain a corresponding unlocking parameter and a generation time point, the dynamic password lock performs consistency comparison on the unlocking parameter obtained by decryption and an unlocking parameter pre-stored in the dynamic password lock, whether the dynamic password is used for the first time or not is judged after consistency comparison is passed, if so, valid time verification is carried out, if not, validity verification is carried out, and when one of the valid time verification and the validity verification is passed, the dynamic password lock is unlocked. The unlocking syst