The invention provides a device for insulating material surface flashover experiment in SF6. Compared with a previous single-pole-pair or multi-pole-pair connecting rod type experimental cavity, the device of the invention can be used to simultaneously study the experiment characteristics of surface flashover under the same atmospheric pressure and different electrode distances and the experiment characteristics of surface flashover under the same flashover distance and different gas pressures, thus realizing the study of multiple insulating samples in a single experiment. Therefore, the number of opening times of the experimental cavity can be reduced, the experimental time and cost are saved, and the use and leakage of SF6 gas are reduced. The device of the invention has the advantages of simple structure, convenient operation, cost saving, high repeatability, and the like.