Provided is a supporting china bottle big umbrellas skit in high voltage transformer substation. The big umbrella skirt comprises an increasing climbing skirt; a gap is arranged in the increasing climbing skirt; sliding groove seats are respective arranged in two sides of the gap and under the bottom side of the increasing climbing skirt; a dovetail groove is arranged in each of the sliding groove seats; each of the dovetail grooves are parallel to the gap; a fixed plate is arranged on the upper part of the gap; two sliding blocks are installed on the fixed plate and cooperate with the dovetail grooves; a U-type plate is arranged on the outer side of the gap of the increasing climbing skirt; the U-type plate sleeves the increasing climbing skirt and the edge of the fixed plate; and a fixed bolt is installed on the U-type plate and penetrates through the U-type plate, the increasing climbing skirt and the fixed plate. According to the utility model, the increasing climbing skirt is tightly pulled towards the middle part so as to cling to an insulator; and adhesion is coated, so stability of connection fixation is enhanced. Even if a glue failure occurs, because the increasing climbing skirt sleeves the insulator, the increasing climbing skirt will not drop, so an effect of anti-icing flashover can be still achieved.