The invention discloses a certificate issuer anonymity entity identification method and system. The method comprises the following steps that: 1) each certificate issuer joining a system generates a private key and a public key of the certificate issuer according to system public parameters; 2) the certificate issuer I generates an identity certificate of the user according to the input user identity identifier, the private key of the certificate issuer I and the system public parameters and transmits the identity certificate to the user; 3) the user selects a plurality of certificate issuersto form a confusion set; an anonymous identity certificate of the user is generated according to the public parameters of the system, the public keys of all the selected certificate issuers and the identity certificate held by the user, and sending the anonymous identity certificate to an identity verifier; Wherein the confusion set comprises a certificate issuer I for issuing a user certificate to the user; And 4) the identity verifier verifies the received anonymous identity certificate according to the system public parameters and the public key of each certificate issuer in the confusion set, and determines whether the received anonymous identity certificate is valid or not.