The invention discloses a roof outgoing line structure of indoor GIS equipment. An existing power distribution device of a 220kV substation, mentioned in the prior art, employs GIS equipment, two outgoing lines share a bridging framework, the framework width is 24 meters, the framework is arranged in a site of the power distribution device and is limited by the site, no enough site of the substation is used for achieving outgoing line scale in planning, so that the scale of the substation is limited, and the development of a power grid is limited. According to the technical scheme, the roof outgoing line structure of the indoor GIS equipment comprises an h-shaped outgoing line framework and roof outgoing line indoor GIS equipment, the h-shaped outgoing line framework comprises an upper-layer outgoing line cross arm, an intermediate-layer outgoing line cross arm, a lower-layer outgoing line cross arm, a first steel pipe rod, a second steel pie rod and a support horizontal rod, the roofoutgoing line indoor GIS equipment comprises the GIS equipment and a sleeve, the GIS equipment is arranged on indoor ground, and the sleeve is connected to an overhead outgoing line on a roof via an air pipe.