The utility model discloses a numerical-control adjustable tool apron. The technical scheme is characterized in that the numerical-control adjustable tool apron is mainly composed of an apron body, a tool sheath and fastening screws; the section of a through hole in the apron body is in a non-circumferential shape; the non-circumferential part of the internal surface of the through hole is a positioning plane; screw holes are formed in the apron body opposite to the positioning plane; the tool sheath is matched with the through hole in the apron body, and is installed in the through hole in the apron body; a whole-length through notch is formed in a part, opposite to the screw holes in the apron body, of the tool sheath; fastening screws are respectively installed in the screw holes in the apron body. Adopting a new positioning way, the numerical-control adjustable tool apron has the advantages of high installation efficiency of a toolbar and rapid and reliable positioning and axial adjustment.