The utility model discloses a retooling mechanism of curved silk robot of numerical control, it includes the retooling motor, the retooling action wheel, the driving wheel is followed to the retooling, the main shaft, the die head dish, the die head, the retooling pneumatic cylinder, mould position locating plate, locating piece and constant head tank, the retooling action wheel is connected with the retooling motor, retooling action wheel and retooling from driving wheel meshing, the die head is installed on the die head dish, the die head dish is connected with the main shaft, the retooling is fixed in on the main shaft from the driving wheel, the driven locating piece that sets up a plurality of angular distribution of waiting that takes turns to of retooling, the retooling be provided with from the top of driving wheel be fixed in before mould position locating plate on the cantilever crane, the position department that mould position locating plate corresponds the locating piece has seted up the constant head tank, main shaft and retooling pneumatic cylinder connection, promote to realize axial removal through the retooling pneumatic cylinder. The utility model discloses a retooling mechanism of curved silk robot of numerical control, curved silk precision is high, and curved silk is efficient, has improved the machining precision and the machining efficiency of the curved silk robot of numerical control greatly.