The present invention relates to a reclamping chuck which includes a chuck body (1), a clamping conical body (3) which coaxially rotates with the chuck body (1) that is axially supported on the claw holder (2) arranged on the chuck body (1), in the claw holder the claw (7) which is guided in the guiding groove (6) can adjust using the claw holder (2) with the relative rotating between the chuck body (1) and the clamping conical body (3) to do clamping and loosening, the chuck also includes a locking device (11) which comprises a teeth ring (13) coaxial with the chuck axis (12) on one hand, onthe other hand comprises a retaining pawl (14) that is engaged in the teeth ring (16) at the function of the spring force and is supported on the claw holder (2), when the retaining pawl (14) is embedded in the teeth ring (13) the locking device locks the chuck body (1) and the retaining pawl (14) to prevent the relative rotation of the claw (7) in the loosening direction, but the relative rotation in the clamping direction is not obstructed. The chuck also includes a loosening ring (20) which is coaxially arranged with the chuck axis (12) and can rotate from the outside, and the loosening ring is acted on the claw holder (2) in order to regulate the retaining pawl between the position where the loosening ring is embedded into the teeth ring and the position that the loosening ring disengages from the teeth ring. The clamping conical body (3) is adjacent disposed and is fixedly connected with the claw holder (2) at the end with a backward axial direction. The loosening ring (20) is provided with a control curve (21) on the surface which lies on the radial direction inward, and the control valve is used to adjust the retaining pawl (14) from the position of embedding into the teethring (13) to the disengaging position when the loosening ring (20) is rotated along the rotating direction that the claw (7) is loosen in rotating the clamping conical body (3).