Unblocking and blocking type clamp positioning device

The invention provides an unblocking and blocking type clamp positioning device which comprises a clamp body and a positioning body mounted on the clamp body. The positioning body is provided with a through passage and a valve body mounting hole inserting with the passage. A valve body is movably mounted in the valve body mounting hole, so that the valve body is movably limited in the positioning body. The valve body is provided with a through hole, which is located in the passage of the positioning body, in at least one position, the passage of the positioning body smoothly passes the through hole of the valve body, and unblocking of the clamp positioning device is achieved; the valve body is provided a through hole, for blocking the positioning hole, in at least one position, and blocking of the clamp positioning device is achieved. The clamp positioning device has the advantages that gas and water feeding of the positioning device can be controlled effectively, waste caused by gas and water feeding when a