The invention relates to a work-piece clamper, which comprises: a base with a hole inserted by main body; a main body whose front end is thick and back end is thin, with a through hollow chamber, while the back end is inserted into the hole of base; at least two radial longitudinal grooves along the outer wall of front end; and a driver that moves main body front and back relative to the base; the inner wall of front end of main body has at least two compressing blocks uniformly distributed along the circumference. Compared with present technique, the invention can machine kinds of small work pieces, with better clamping effect and high accuracy, without deflecting the work piece. |