An electronic signature verification method implemented by SKI infrastructure adopts a secret key infrastructure (SKI) system for registering a secret key and issuing a signature key and a verification key. After a signer has completed a signature, a signature data, a verification data and a verification key encrypted by the secret key of a signature verification unit are sent to a recipient. After the recipient has received the data, a user needs to send the verification data and the encrypted verification key to a signature verification unit if the user wants to confirm the signature on the signature data. The signature verification unit uses a secret key authorized by the SKI for the decryption to obtain the verification key and uses the verification key to verify the verification data and confirm the existence of the signature of the signature data, so as to authenticate the signature of the signature data.