The invention discloses a compression arc extinguishing insulator connected in series and belongs to the technical field of lightning protection of transmission and distribution overhead lines. The compression arc extinguishing insulator connected in series comprises a plurality of insulators and connecting rods. The plurality of insulators are connected in series through the connecting rods to form an insulator string. Both ends of the insulator string are provided with compression arc extinguishing devices. Each compression includes an arc-guiding electrode, a wire, and an end insulator. Thearc-guiding electrode is arranged on an external connecting piece, and is connected to the end insulator through the wire. The compression arc extinguishing insulator connected in series advances thearc extinguishing time from the traditional through flashover insulation coordination to the local flashover insulation coordination. After the local flashover, most insulation does not break down, and only generates surface discharge. At this time, an arc extinguishing object is only a stream of weak impulse arc with high vulnerability and low arc extinguishing difficulty.