The invention relates to an authentication method, device and system for preventing a lock from being duplicated, and an electronic key for preventing the lock from being duplicated. The authentication method comprises the steps that the electronic key judges whether the accessed lock is an intelligent lock or not, when it is judged that the accessed lock is the intelligent lock, power supplying is conducted on the intelligent lock, and a communication secret key of the intelligent lock is obtained; whether the obtained communication secret key of the intelligent lock is correct or not is verified, and when it is verified that the obtained communication secret key of the intelligent lock is correct, the type of the intelligent lock is obtained; whether the obtained type of the intelligentlock is correct or not is judged, and when it is judged that the obtained type of the intelligent lock is correct, internal ID of the intelligent lock is obtained; and whether the obtained internal IDof the intelligent lock is correct or not is judged, and the obtained internal ID of the intelligent lock is correct and is target ID, the lock is authenticated successfully. According to the authentication method, device and system for preventing the lock from being duplicated, and the electronic key for preventing the lock from being duplicated, the problem that the intelligent lock is duplicated artificially and illegally is effectively solved, and thus the problem that a counterfeit lock or intelligent lock is merged into a lock management system is effectively eradicated.