The traditional network access authentication technology is difficult to meet the characteristics of Beidou communication network, such as heterogeneous dynamics, intermittent connectivity, high exposure, large scale and limited resources. Therefore, this paper proposes a software for the unified access authentication technology of Beidou communication network. Define the unified access authentication architecture and decision-making method of Beidou communication network, realize flexible and definable authentication methods through the separation of control layer and device layer, and achieve the effect of unified management of secure access authentication and resource optimization control; on the basis of the proposed architecture, A variety of attributes affecting access point decision-making are proposed, and an access point decision-making combining analytic hierarchy process and ideal solution method is designed, which realizes the selection of the optimal access node and improves the access success rate and efficiency. The encryption method is used to identify counterfeit terminals and abnormal terminals, strengthen the reliability of terminal to satellite, terminal to ground enhanced substation, and business security, and realize all-round trusted access.