The utility model relates to a device for closed close clearance multi-electrode gas switch, including sealed insulating casing, vertical insulation board, pulse voltage generating device, a plurality of copper-tungsten ball and equalizing resistance pipe and coupling capacitor, establish insulated supporting plate and two electrically conductive bracing pieces between vertical insulation board opposite side and the sealed insulating casing tip inner wall, establish a plurality of coupling capacitor between two electrically conductive bracing pieces and the insulated supporting plate, insulated supporting plate is last to establish many eradications along the pillar, every eradication is the fixed copper-tungsten ball that corresponds on along the pillar, every eradication is located directly over the corresponding coupling capacitor along the pillar, a plurality of coupling capacitor staggered arrangements on a plurality of coupling capacitor on electrically conductive bracing piece and another electrically conductive bracing piece, insulated supporting plate is last to establish a plurality of even resistance pipe caps, it is gapped between two adjacent copper-tungsten balls. The utility model discloses has the characteristic that the synchronism is good, the trigger range is wide.