The invention relates to the technical field of network security, and discloses a single sign-on method, which comprises the following steps: receiving a first login request sent by a client, and verifying user information in Redis; if the verification result is correct, generating a session and an authentication identifier ticket with the session; sending the ticket and the system address corresponding to the first login request to the client, and authorizing the client to log in the system address; storing the session in the Redis on the basis of a shiro framework; receiving a re-login request sent by the client and the ticket, and judging whether a session corresponding to the ticket exists in the Redis or not on the basis of the shiro; and if the session corresponding to the ticket exists in the Redis, authorizing the client to log in the corresponding login address in the re-login request based on the session corresponding to the ticket. The invention further discloses a single sign-on device, single sign-on equipment and a computer readable storage medium. According to the invention, the burden of system data storage is reduced, and the data processing speed of the system iseffectively improved.