The invention discloses an electric GIS (Gas Insulated Switchgear) cross-platform spatial data service system which is used for establishing a set of cross-platform deployed three-tier architecture spatial data service platform and a related client memory space database by adopting a cross-platform spatial data service engine and a local spatial database management technology. The electric GIS cross-platform spatial data service system realizes access and data scheduling to spatial databases, such as OracleSpatial and ArcSDE by using a standard HTTP (Hyper Text Transport Protocol) and adopting an expanded Apache Web server as a server; and a client adopts a GeoStar compatible spatial database access interface so as to realize rapid acquisition and memory-based rapid access to the server spatial database, therefore, the spatial data acquisition efficiency when a large amount of users concurrently access a power grid space information service platform is met and the user experience is promoted.