The invention provides vehicle-mounted complete equipment with transformer and GIS direct connection. The complete equipment comprises a transformer body and a GIS body. The transformer body and the GIS body are detachably installed at two sides of the vehicle plate of a same vehicle. The equipment is novel electrical complete equipment, and the compactness and fulling sealing of electrical equipment are realized by the GIS body and the transformer through compact oil and gas casing direct connection and a plug-in type cable terminal. The complete equipment is applied to a vehicle-mounted mobile substation, a vehicle carrying need is fully satisfied, the influence on surrounding environment by putting the mobile substation into operation at any time is effectively reduced due to a compact design, the safety reliability of the mobile substation in unconventional occasion application is improved, the weight and land occupation of electrical equipment are greatly reduced, the field response speed of the mobile substation is improved, and the actual needs of the trafficability of domestic mountain and city most roads are satisfied.