The utility model discloses a portable flange mat preparation ware, including contact clamp plate, support cylindrical, support carrying plate, spring compression groove, take in circular slot, perforation, down depression bar, pressure disk, locating cone, footboard, compression spring, the rotatory lantern ring, adjust and fill up pipe, square guide arm, sliding sleeve, supporting splint, support shaft, disc cutting knife, extension round platform, screw hole, holding screw. The utility model discloses the structure principle of device is simple, is difficult for the circumstances of the system of cutting to the interior outer hole limit in preparation flange pads process, and the synchronous shaping cutting of outer hole in quick is carried out to the unshaped backing plate to the characteristic of utilizing rotatory cutting knife rotate on the circumference and cut, possesses adjustable function simultaneously, can satisfy the flange gasket of different model bores and make, and whole device is small and exquisite lightly, easy operation.