The invention relates to an electrical cabinet, a cabinet body thereof, and a high-voltage module. The electrical cabinet comprises the cabinet body and the high-voltage module. An upper cross beam and a lower cross beam are arranged in the cabinet body, a guide structure which extends in the front-back direction is arranged on the upper cross beam, the upper side of the high-voltage module is provided with a hooking structure which is hooked on the guide structure and is matched with the guide structure in a guiding and moving mode in the front-back direction, the lower side of the high-voltage module is provided with a connecting structure used for being fastened and connected with the lower cross beam, and the upper side of the high-voltage module is provided with a hooking structure used for being hooked on the guide edge of the upper cross beam, in the installation process, the high-voltage module is hooked on the upper cross beam through the matching of the hooking structure andthe guide structure, the high-voltage module is enabled to move towards the cabinet body by applying thrust to the high-voltage module, the high-voltage module can keep a relatively stable state underthe action of gravity in the moving process, and therefore deflection is avoided, and the problem that the installation is inconvenient due to the fact that the high-voltage module in an existing electrical cabinet is inclined and deadly clamped during installation is solved.