The invention provides a method, device and system for performing authentication and authority management on a user using a container management cluster, and a medium. The method comprises the following steps: a registration step: sending a registration request to the container management cluster, and storing a service account and authentication information created by the container management cluster for the user; a login step: responding to a login request, taking out authentication information of the user, and authenticating whether the user successfully logs in according to the authentication information by the container management cluster; an authorization step: after determining that the user has successfully logged in, creating one or more items for an authorization request of the user, storing a namespace created by the container management cluster, and sending the service account and space of the user to the container management cluster for authorization; and an authenticationstep: responding to an operation request, taking out namespaces in one-to-one correspondence with items in the operation request, and authenticating the operation request by the container management cluster based on an authorization result of the service account and the namespaces.