The invention discloses an authentication and certification method applicable to a satellite DCS. The situation that a satellite covers a gateway station and the situation that the satellite deviates from the gateway station are discussed separately. The method comprises the following steps that A, when the satellite covers the gateway station, authentication and certification are carried out on a DCP terminal according to a gateway station local database and a safety management module inside the gateway station, and the process flow is designed; B, when the satellite deviates from the gateway station, authentication and certification are carried out on the DCP terminal according to a satellite local database and a safety management module inside the satellite, and the process flow is designed; C, the storage capacity on the satellite is considered, and a user identification code updating scheme on the satellite is provided. According to the authentication and certification method, the satellite only stores identification information of the DCP in a gateway station area which the satellite does not cover, and the timed updating scheme is adopted so as to ensure the real-time performance of interaction between the satellite and the ground DCP.