The invention discloses an installation method of a high-voltage switch cabinet, which comprises the following specific steps: (1) installation of a cabinet body; (2) installation of a bus bar; and (3) cable laying and wiring. According to the above mode, the installation method provided by the invention of the high-voltage switch cabinet is high in installation precision and simple, time and labor saving, capable of reducing the labor intensity of assembly workers, balanced and stable in force application, accurate in installation position and reliable in electrical connection, eliminates potential safety hazards and ensures the safe and reliable operation of the high-voltage switch cabinet.