Central venous pressure measuring tool

The utility model discloses a central venous pressure measuring tool which comprises a bottom plate, a vertical plate is arranged on the top face of the bottom plate, the bottom end of the vertical plate is fixedly connected with the top face of the bottom plate, and the vertical plate is vertically arranged. When the locking handle is pulled, the locking pin moves back and forth on the inner side of the limiting groove through the spiral effect of the locking screw and the locking pin, it is ensured that the sliding block can stably move up and down on the inner side of the sliding groove through the elastic force of the spring and the locking screw, and the side face of the locking pin is tightly attached to the side face of the rail. Moving and locking of the movable frame on the inner side of the sliding groove are achieved through static friction between the locking pin and the rail, the level position of the 0 scale line at the bottom end of the ruler and the axillary midline of a patient can be conveni