The utility model relates to a power grid operation and power user device, in particular to an opening device special for a middle switch cabinet door. The opening device comprises a base. The base is composed of a square sleeve and a magnet. The magnet is sleeved with the square sleeve. The four sides of the base are connected with insertion sleeves. Every two adjacent insertion sleeves are connected through rubber, and keys are arranged in the insertion sleeves. A combined operation tool is adopted, and the opening device is convenient to use and carry, practical, and capable of improving working efficiency.