The invention relates to a switch unit structure. The switch unit structure includes a press mounting switch device, voltage balancing devices, a device drive, a drive clamp, and a drive power supply. The switch unit structure is characterized in that the press mounting switch device is arranged inside the whole structure, the voltage balancing devices are assembled to be a voltage balancing device integrated modularized structure through press mounting members and are arranged on two sides of a frame structure of the press mounting switch device through structure supporting plates, the device drive is connected at one side of the switch device, and then an integrated compact switch unit structure is formed. The advantages of the switch unit structure are that the switch device and a radiator member are arranged inside the frame via a press mounting mechanism, the voltage balancing devices are assembled to be a whole structure through the press mounting members, and the voltage balancing devices are arranged on the entire press mounting mechanism through buses, so the switch unit structure is compact in structure and reliable in electrical connection, is convenient to mount, dismount and maintain, and exhibits good properties; and the supporting structures are made from high-strength insulating materials, so the insulating coordination dimension of the whole structure is effectively reduced.