The invention discloses a tool drilling device for numerical control tool magazine machine tool machining. The device comprises a base, a supporting column is arranged on the base, a cross beam plateis arranged on the side wall of the supporting column, a bulge is arranged at the middle end of the cross beam plate, a movable seat is arranged on the bulge in a sliding mode, a rotating shaft is connected to the lower end of the movable seat, a clamping seat is fixedly arranged at the end part of the rotating shaft, and the left end and the right end of the clamping seat are each provided with aclamping air cylinder. The device has the advantages that the structure is simple, the drilling precision of the surface of a tool is high, the tool error is reduced, and the product quality is improved.