Zero point positioning device

The invention relates to the field of machine tool parts, in particular to a zero point positioning device which comprises a base and a plurality of positioning blocks, the positioning blocks are arranged on the base at intervals, each positioning block comprises a positioning portion and an installation portion, the installation portions are arranged on the base, the positioning portions are arranged on the installation portions, and the outline of the side wall of each positioning portion is in an involute shape. The spring piece base has the advantages that the requirement for the machining precision of the spring piece is lowered, the spring piece can be conveniently separated from the base, and the positioning precision of the base on the base is improved. 本申请涉及机床零部件的领域，尤其是涉及一种零点定位装置，其包括底座和多块定位块，多块定位块间隔设置在底座上，定位块包括定位部和安装部，安装部设置在底座上，定位部设置在安装部上，定位部的侧壁的轮廓呈渐开线形。本申请具有降低弹簧片加工精度要求，方便弹簧片从底座上脱离，提升基座在底座上的定位精度的效果。