The invention provides a method for authenticating identification by biological specificity. The method comprises the following steps: firstly, a transmitting end generates a biological specificity digital certificate, wherein generation of the biological specificity digital certificate comprises the following steps: generating a public and private key pair; extracting biological specificity point information, transmitting the public key in the public and private key pair, the biological specificity point information and personal register information to a CA center, and signing and generating the biological specificity digital certificate by the CA center; secondly, time of two communication parties are synchronized, and during communication, a current time stamp of the transmitting end is extracted, the time stamp is loaded into the biological specificity digital certificate, and the biological specificity digital certificate is signed by the private key corresponding to the public key and is transmitted to a receiving end; and finally, the receiving end decrypts the biological specificity digital certificate by the public key, and determines whether the identification passes the authentication or not according to the time stamp in the biological specificity digital certificate and the biological specificity point information. The invention makes identification authentication more secure and more reliable.