Transformer capacitor DC isolation device

A transformer capacitor DC isolation device of the present invention comprises a box body, a capacitor, a thyristor, a support and a first insulating member, and the capacitor, the thyristor, the support and the first insulating member are all arranged in the box body. The box body comprises a bottom plate, the capacitor and the thyristor are fixed on the support, and the first insulating member is located between the support and the bottom plate. The support and the box body are isolated by the first insulating member, and the capacitor and the thyristor are arranged in the support overhead and are located in the overhead states, so that the capacitor and the thyristor keep the certain distances with the side plates, the bottom plate and a top plate of the box body, the probability of contact discharge and air discharge is reduced fully, and the insulating voltage withstanding performances of the capacitor and the thyristor are improved, and accordingly, the transformer capacitor DC isolation device accords