Authorization method and device of NAS equipment, NAS equipment and server

The invention discloses an authorization method and device of NAS equipment, NAS equipment and a server. The method includes the steps that a measurable log transmitted by the server is received; whether the measurable log is credible or not is judged; if it is judged that the measurable log is credible, information for successful authorization is generated; the information for successful authorization is transmitted to the server. The NAS equipment judges whether the measurable log is credible or not to determine whether the server is authorized to get access to the NAS equipment or not, it is ensured that important data stored in the NAS equipment are still protected under the condition that the server is captured, and therefore the safety of the NAS equipment is improved.