Abstract: Provided are a composite identity authentication method and a composite identity authentication system using the same. The composite identity authentication system is applied to a blockchain network and includes an authenticator and terminals. The composite identity authentication method is based on the blockchain network, and can ensure both the security and the generality. The multiple authentication mechanisms can be used flexibly according to different security levels, and flexible terminal authorization methods are provided to make management more convenient. The composite identity authentication system is applied to the blockchain network, and the terminals connected to the blockchain network can call data from the blockchain, which avoids repeated data entry in different terminals. Different authentication contents can be configured in terminals of different security levels, rendering the authentication of the system more flexible.