With the rapid development of information technology,the security of authentication mechanism has received more and more extensive attention.However,the existing identity authentication mechanism has the risk of privacy threat.Thus,designing a more reliable authentication mechanism is in urgent need.This paper designed a multi-party collaborative security authentication mechanism based on the blockchain for its decentralized and tamper-proof features.While achieving reliable identity authentication,it ensures the authority of information,reduces data redundancy,improves the authentication efficiency,and realizes comprehensive and accurate authentication.Finally,the authentication system is implemented,which enables multiple data service providers to encrypt and sign identity information,protect data privacy,and share data with multiple parties.