The invention relates to a stack-type multi-gap gas switch comprising a cylindrical outer insulation barrel, a disc-shaped upper cover plate, a disc-shaped lower cover plate, at least three ring electrodes, a triggering connector, an air tap and a plurality of ring-shaped insulation cushion blocks. The disc-shaped upper cover plate is fixed at the upper end of the outer insulation barrel; the disc-shaped lower cover plate is fixed at the lower end of the outer insulation barrel; the triggering connector is arranged in a plane of the outer insulation barrel; the upper cover plate and the outerinsulation barrel as well as the lower cover plate and the outer insulation are sealed; the plurality of ring-shaped insulation cushion blocks with the same amount as the ring electrodes are arrangedin the outer insulation barrel; a plurality of evenly distributed air holes are arranged on the outer side of the insulation cushion block; and a circular groove is arranged on the lower surface of the upper cover plate and is internally provided with an elastic metal ring contacted with an electrode of an uppermost stack assembly. The invention solves the technical problems of poor installation precision and complex installation process of the traditional multi-gap gas discharge switch and has the advantages of simple structure of the switch, convenient installation and operation process andhigh assembling precision.