Numerical control calibration tool

The utility model discloses a numerical control calibration tool. The numerical control calibration tool comprises an outer ring tool (1) and an inner ring tool (3), wherein the outer ring tool (1) consists of a disc pedestal I; a circular through hole I (6) is formed in the center of the disc pedestal I; the edge of the disc pedestal I is provided with a trough rim (2); the inner ring tool (3) comprises a disc pedestal II and a circular boss (4); the circular boss (4) is arranged on the upper surface of the disc pedestal II; the diameter of the disc pedestal II is matched with the diameter of the circular through hole I (6), and the disc pedestal II is arranged in the circular through hole I (6); the height of the disc pedestal II of the inner ring tool (3) is the same as the height of the disc pedestal I of the outer ring tool (1). The numerical control calibration tool has the beneficial effects that the one-by-one calibration work of annular workpieces is saved, the operation time is saved, the working ef