The invention discloses a high-pressure solid switch which comprises an insulation cylinder, a plurality of single-layer circuit boards and electrodes. The single-layer circuit boards are arranged in the insulation cylinder in an overlapping mode. Each single-layer circuit board is used for placing of a power electronic device and an auxiliary circuit of the power electronic device. The electrodes are used for being connected with the single-layer circuit boards and a uniform electric field. According to the high-pressure solid switch, the problem existing in the arrangement structure of power electronic devices in the prior art is solved, and the effect that the power electronic devices are compact in arrangement structure, small in size, high in voltage-withstanding level, low in partial-discharge level, easy to expand and great in performance is achieved.