The invention provides a thyristor valve for a static var compensator. The thyristor valve comprises at least three thyristor valve layers, interlayer union nuts, a water-cooling system, a first insulator and a second insulator. The thyristor valve layers are supported by the first insulator and are connected in the shape of Z via the interlayer union nuts. The lower-most thyristor valve layer is fixed on the horizontal plane through the second insulator. The water-cooling system comprises a water inlet pipe, a branch water path and a water return pipe, wherein the water inlet pipe, the branch water path and the water return pipe are successively connected in series. The water flows in the thyristor valve through the water inlet pipe, then flows through the branch water path and finally flows out of the thyristor valve through the water return pipe. The branch water path is positioned inside the thyristor valve layers. According to the technical scheme of the invention, the thyristor valve layers of the thyristor valve for the static var compensator are stratified in layout and are connected end to end in the shape of Z. Based on the above connection manner, the voltage between every two thyristor valve layers is kept the same. Therefore, the internal electric field of the entire thyristor valve is ensured to be uniform. Two thyristor units can be triggered by a thyristor control unit, so that the cost is saved. Meanwhile, the size of the thyristor valve is reduced.