Cutter positioning structure of internal cooling type numerical control tool apron

A tool positioning structure of an inner-cooling type numerical control tool apron is matched with the tool apron and used for positioning and installing a tool on the tool apron, it is guaranteed that the axis direction of the tool is consistent with that of the tool apron, and therefore the axis of the tool coincides with the rotation center axis of a workpiece conveniently. The tool positioning structure comprises tool apron clamping pieces, tool clamping pieces and a driving piece, the multiple tool apron clamping pieces and the multiple tool clamping pieces are arranged on the two sides of the driving piece correspondingly, the driving piece is connected with the tool apron clamping pieces and the tool clamping pieces correspondingly, and the tool apron clamping pieces and the tool clamping pieces are driven by the driving piece to move in the direction perpendicular to the axis of the tool apron. The cutter positioning structure can be conveniently installed on a cutter holder through movement of the cu