The invention discloses a two-side authentication method for a power system, and the method is used for a wireless communication network. The method comprises the steps that a first communication node generates a first public and private key pair as a secret key pair, and generates a part of second secret keys; a second communication node generates a second public key, and generates the second secret key according to the part of second secret keys, wherein the second secret key pair serves as the secret key of the second communication node. Therefore, the method improves the safety of the system.