The utility model relates to a cutting machine tool field, in particular to cutting machine tool positioning mechanism, cutting machine tool be including the workstation, and positioning mechanism isincluding base, first slip table and second slip table, and the pedestal mounting is at the up end of workstation, first slip table sliding connection is in base upper end, and second slip table sliding connection is in first slip table upper end, the slip direction mutually perpendicular of first slip table and second slip table, the lateral part of base is equipped with an adjusting screw who promotes first slip table and move, is equipped with the damping machanism corresponding with an adjusting screw in the base, the lateral part of first slip table is equipped with the 2nd adjusting screw who promotes the second slip table and move, and the top of first slip table is equipped with two damping machanism corresponding with the 2nd adjusting screw, and a plurality of T type grooves havebeen offered at second slip table top. The utility model discloses under the condition of at first establishhing the coordinate system, tool setting once more may not be used in follow -up change work piece model and cutter compensation, avoids the waste of raw metal to improve work efficiency.