The invention discloses a gas insulation isolating switch device, comprising a shell, an isolating switch and at least a ground switch; the isolating switch comprises a moving end part and a fixed end part; the moving end part comprises a moving end shielding case, a moving contact seat, a moving contact and a moving contact shielding case; the moving end shielding case is provided with a ground switch fixed contact; the fixed end part comprises a fixed end shielding case, a fixed contact seat, a fixed contact and a fixed contact shielding case; the moving contact and the fixed contact are horizontally arranged; the opening direction is coherent with the axes of the shell; the moving end part is connected with an operating transmission mechanism; the device is characterized in that: the operating transmission mechanism is transmission mechanism meshed by gear and rack, or mechanism of lead screw transmission; the rack or lead screw is directly connected with the moving contact conductor or the moving contact. The invention is able to realize the direct connection and three-phase joint, and has flexible arrangement according to different connection modes, and is suitable for GL type isolating switch and GR type isolating switch, and has good commonality and high standardization degree.