Special clamp for machining grille group holes through abrasive flow

The invention discloses a special clamp for machining grille group holes through abrasive flow. The special clamp comprises a clamp upper cover (1), a support ring (3) and a clamp base (4). The clampupper cover (1) and the clamp base (4) are mounted at the two ends of the support ring (3) correspondingly. The special clamp is characterized in that the clamp upper cover (1) and the clamp base (4)are provided with through holes allowing the abrasive flow to pass through; the support ring (3) is provided with a cuboidal clamp body (2); a grille workpiece (7) with the grille group holes is located in the cuboidal clamp body (2) through a lower flow guiding plate (5) and an upper flow guiding plate (9), wherein the lower flow guiding plate (5) and the upper flow guiding plate (9) are obtainedthrough additive manufacturing and are the same in hole position; the central lines of all the grille group holes in the grille workpiece (7) are parallel with the central lines of the through holeswhich are formed in the clam