The utility model relates to a novel transistor switching capacitor (TSC) valve block, which is characterized in that three single-phase thyristor valve blocks are connected to a TSC device and used for switching capacitors respectively; a three-phase controlled triangular connection mode is adopted, each branch is sequentially connected to a reactor, the single-phase thyristor valve block and the capacitor in sequence, the single-phase thyristor valve blocks are connected to the branch in series, each of the single-phase thyristor valve block is formed by connecting a voltage equalizing unit, an RC resistance-capacitance unit, a thyristor unit, a trigger feedback unit and a power taking unit in sequence, the thyristor unit is taken as a core, each of the thyristor unit is formed by connecting two thyristors in an anti-parallel mode, the corresponding RC resistance-capacitance unit and the voltage equalizing unit are arranged, each TSC board controls one or two thyristors, a power supply is provided for the TSC board by the corresponding power taking unit, the power taking unit adopts a mode that a power taking cable of output of an external high-frequency power supply output penetrates through a power taking magnetic ring, thereby not requiring pre-charging the capacitors, being simple and reliable in power taking circuit, and reducing the design difficulty of the valve block at the same time.