The invention discloses a 220kvGIS power distribution device. The device comprises an all-optical fiber electronic current transformer. The all-optical fiber electronic current transformer comprises an electric unit. The electric unit is connected with three optical sensitive loops, namely an A-phase optical sensitive loop, a B-phase optical sensitive loop and a C-phase optical sensitive loop, through connecting optic cables. The device is characterized in that: the all-optical fiber electronic current transformer is positioned outside a GISSF6 air chamber and is arranged at a zero level. The device has a simple structure, does not change the primary structure of a GIS body, is only arranged outside a GIS air chamber, can effectively improve the working reliability of the GIS body and the electronic current transformer and is convenient to maintain and replace at the same time.