The invention discloses a power lock management method and system. The method comprises the steps of: a field service terminal unit receiving the encryption information of a service application and aID number of a lock needed to be opened and closed sent by a power service application unit; the field service terminal unit receiving a specific identifier transmitted by a power lock; the field service terminal unit decrypting the encryption information of the service application, and encrypting the specific identifier of the power lock according to a public key of the lock to form terminal encryption information and transmitting the terminal encryption information to the power lock; and the power lock comparing a specific identifier obtained by decryption using a private key of the lock with the specific identifier of the power lock, and if the comparison is consistent, completing the locking and unlocking operations. The power lock management method and the devices realize that the staff does not need to carry the key for locking and unlocking the lock when working in the field, and the locking and unlocking operation can be completed only by using the original field operation terminal, thereby satisfying the requirements of the enterprise for the safety and convenience of the power lock management system.