The utility model relates to a manual clamping device for clamping a test piece. The device comprises a housing, bevel fluted disc supporting body, a conical fluted disc and a conical fluted disc bearing, bevel pinion I, bevel pinion I shaft, bevel pinion I bearing, a blocking cover and a flange plate type connecting body, an inner inverted conical fluted disc, an inner inverted conical fluted disc bearing, a base mounting body, a cylindrical ring type connecting body, a bevel pinion II, a bevel pinion II shaft, a bevel pinion II bearing I, a base I, a specially-made clamping jaw I, a circumferential fixing frame I, a bevel pinion II bearing II, a base II, a specially-made clamping jaw II, a circumferential fixing frame II and a self-locking device are included. A turning pawl of the self-locking device is matched with the ratchet wheel; the self-locking of the clamping device is completed, through a series of transmission mechanisms, the specially-made clamping jaw I completes the clamping work of the inner wall of a test piece, the specially-made clamping jaw II completes the clamping work of the outer wall of the test piece, and the clamping device has the advantages of being simple and compact in structure, good in manufacturability, convenient to operate and the like.