For the space data network distributed in different cities, it is an urgent need to build a private network within each substation relying on the space backbone network. MPLS-VPN multilayer label technology is applied to the aerospace data network to achieve high-speed forwarding of business data and enhance its stability and security. This paper mainly introduces the principles and key technologies of MPLS-VPN, proposes a set of MPLS-VPN aerospace data network structure combined with the current situation of cross-field aerospace data network construction, analyzes the deployment of using MPLS-VPN to achieve networking, and simulates the networking environment of cross-field aerospace data network through experiments. Using two kinds of common user service data as the scene, through the test of network performance indicators, the advantages of MPLS-VPN architecture are verified.