The invention relates to double-break switch equipment and a monopole structure thereof. The monopole structure comprises a rack, a first arc extinguishing chamber and a second arc extinguishing chamber, wherein the first arc extinguishing chamber and a second arc extinguishing chamber are horizontally arranged from high to low; the right end of the first arc extinguishing chamber and the right end of the second arc extinguishing chamber are fixedly arranged on the rack; the first arc extinguishing chamber is provided with an upper conducting base conductively connected with a moving contact of the first arc extinguishing chamber; the second arc extinguishing chamber is provided with a lower conducting base conductively connected with a moving contact of the second arc extinguishing chamber; support parts of which the limit directions face upwards and which are respectively matched with the first arc extinguishing chamber and the second arc extinguishing chamber in a support manner are respectively arranged on the upper conducting base and the lower conducting base; the upper conducting base and the lower conducting base are connected through a support conducting bar; the lower end of the lower conducting base is provided with an insulation support pillar. Through the double-break switch equipment and the monopole structure thereof disclosed by the invention, the problem that equipment is crowded due to the fact that the two arc extinguishing chambers in the monopole structure are respectively and vertically arranged is solved.