The invention discloses a tube bus corner supporting fitting, relating to the technical field of tube bus corner supporting fittings and reducing the use number of column insulators in a valve hall. The tube bus corner supporting fitting comprises a supporting frame, a pressure equalizing ball or a pressure equalizing ring is arranged outside the supporting frame in a sleeved mode, the supportingframe comprises an upper supporting plate and a lower supporting plate, the upper supporting plate is used for being connected with a lightning arrester, the lower supporting plate is used for being connected with a column insulator, a first tube bus hoop and a second tube bus hoop are arranged between the upper supporting plate and the lower supporting plate, the first tube bus hoop is electrically connected with the second tube bus hoop, and the first tube bus hoop or the second tube bus hoop is electrically connected with the lightning arrester, the axis of the first tube bus hoop and the axis of the second tube bus hoop are not overlapped. The tube bus corner supporting fitting is used for supporting the tube buses and realizing the segmentation and turning of the tube buses.