The high-voltage parallel capacitor tower is suitable for reactive power compensation in load tests of transformers and reactors of 35kV and above. It adopts pneumatic switch control, which can realize the automatic switching of capacitor's series and parallel, single-phase and three-phase, and star-delta. It can automatically calculate the required compensation capacity under different capacity products according to the parameters of the test product, without manual calculation. The voltage and capacity of the capacitor tower can be customized according to the product parameters.