The invention relates to a transformer substation combined electric appliance power distribution device, and particularly relates to a 220 kV bus lengthened type single-row GIS equipment. The 220 kV bus lengthened type single-row GIS equipment is structurally characterized in that the line-side voltage transformers of two groups of buses are upwardly arranged above a line-side outgoing branch bus.The group B of buses is arranged below the line-side voltage transformer of its own group and the line-side voltage transformer of the group A of buses. Between the current transformer of the group Bof buses and the circuit breaker of the group B of buses, a long sleeve internally provided with a branch bus is arranged to connect the current transformer with the circuit breaker. The group A of buses is arranged to be tightly attached to the circuit breaker of the group A of buses. The group A of buses and the line outgoing equipment of the group B of buses are located in the lower space of the long sleeve connected between the current transformer of the group B of buses and the circuit breaker of the group B of buses. In this way, the group A of buses is equal to the group B of buses inlength. The group A of buses and the group B of buses are parallel and are in the lower-order arrangement of the same plane. The 220 kV bus lengthened type single-row GIS equipment is simple and convenient in construction, and the overall layout of the power distribution device is not changed at all. Meanwhile, the double-layer wire outlet is not needed and the construction cost is effectively reduced. The line wiring is clear and simple, and the operation reliability is improved. Meanwhile, the operation and maintenance difficulty is reduced.