The invention discloses a distributed access 
authentication management method in an LEO 
satellite network. By adoption of an identity-based 
cryptosystem, the public and private key pair of a user and a 
satellite node is rapidly generated by utilization of the private key of a 
key generation centre; furthermore, identity information is appointed in an identification field, so that role differentiation in a 
system is realized; simultaneously, on the basis of a chain distributed storage technology of a 
blockchain, a trusted chain taking the 
key generation centre and a 
satellite as trust main bodies is constructed; the identity 
authentication function for 
rapid access authentication and inter-satellite rapid switching of users can be realized; the method is suitable for dynamic topology and frequent switching of a satellite-to-earth link in the LEO 
satellite network; on the other hand, the distributed storage technology of the 
blockchain is adopted in the method; the trusted chain is used as a 
consensus mechanism; related information, such as user registration, cancel, login, logout and switching, can be recorded; the accuracy, the integrity, the consistency, the retrospective property and the non-tampering property of user logs can be ensured; and thus, 
bottleneck restriction of centre nodes on the access function and the authentication property can be avoided.