The invention relates to an outdoor 500kV HGIS power distribution device structure and solves a disadvantage that practical demands can not be satisfied by an HGIS equipment arrangement structure in the prior art. The outdoor 500kV HGIS power distribution device structure comprises the HGIS equipment and a framework assembly, wherein the HGIS equipment comprises an incoming wire breaker, a middle breaker and an outgoing wire breaker which are sequentially and linearly arranged, a first end of the incoming wire breaker is equipped with an incoming wire casing, a tail end of the incoming wire breaker is equipped with a first bus casing, a first end of the middle breaker is connected in parallel with the first end of the incoming wire breaker through a branch bus, a tail end of the middle breaker is equipped with an outgoing wire casing, a first end of the outgoing wire breaker is connected in parallel with the tail end of the middle breaker, and a tail end of the outgoing wire breaker is equipped with a second bus casing. According to the outdoor 500kV HGIS power distribution device structure, not only can a vertical dimension of a 500kV HGIS power distribution device be effectively compressed, incoming/outgoing wire leading modes are optimized, and the framework and crossbeam arrangement structures are simplified.