The utility model provides an ultrasonic testing's supplementary probe dish is carried out different pipe diameter circumferential welds, includes: main frame, symmetry set up the auxiliary frame in the main frame both sides, and wherein, the main frame includes: that the symmetry sets up is preceding, after -fixing board, symmetry installation in the front, the main frame area tooth guide rail of after -fixing inter -plate, the two main frames probe loading arm of loading on two main frame area tooth guide rails respectively, the auxiliary frame includes: connect respectively in the front, two auxiliary frame angle modulation bases on the after -fixing board, the pin joint at the auxiliary frame rotating base of two auxiliary frame angle modulation base both sides, install the inboard auxiliary frame area tooth guide rail at auxiliary frame rotating base, the two auxiliary frames probe loading arm of loading on the tooth guide rail of auxiliary frame area respectively. The angle of whole auxiliary frame is adjusted through the rotation angle who adjusts two auxiliary frame angle modulation bases. The utility model discloses can satisfy multiunit probe detect process's requirement simultaneously, make enough ultrasonic testing device operations stable, greatly reduced the cost drop into.