The invention discloses a 500 kV GIS high-voltage distribution device, which comprises an outgoing line beam and is characterized in that the width of the outgoing line beam is 24.5 m, a V-shaped suspension insulator string for transition of outgoing lines and jumpers is arranged under the beam, and lines are led from the suspension insulator string to a line strain suspension insulator string. On the basis that a 500 kV GIS remarkably reduces occupied area of a 500 kV transformer substation, the distribution device analyzes the width of 500 kV overhead outgoing lines for limiting the transverse occupied area of the distribution device, checks and analyzes electrical distance for the underslung suspension insulator string of the outgoing line beam and lead wires, optimizingly compresses the width and decreases the occupied area of the distribution device on the whole, thereby more sufficiently bringing the advantages of the 500 kV transformer substation into play.