The utility model provides a layout structure of an ultra-high voltage controllable high resistance low voltage side device. The layout structure includes a double-layer valve chamber. The valve chamber includes: a controllable high voltage reactor device chamber at a first layer of the valve chamber, and a valve group device chamber at a second layer of the valve chamber; the controllable high voltage reactor device chamber is internally provided with a controllable high voltage reactor; and the valve group device chamber is internally equipped with a valve group. According to the above layout structure, the controllable high voltage reactor and the valve group are arranged in the chamber in a laminating manner; compared with an open single-layer layout method of the device in the prior art, the floor area of the device is greatly reduced; and because the layout structure of the ultra-high voltage controllable high resistance low voltage side device provided by the utility model covers an small area, the engineering quantity in building the soil retaining wall, slope, earthwork is reduced when the device is arranged, thereby saving the engineering investment.