Central venipuncture auxiliary device

The utility model discloses a central venipuncture auxiliary device. A U-shaped support is provided with scale marks. The base is hinged to the U-shaped support in a damping mode, and a puncture through hole is formed in the base; the sliding block is arranged on the U-shaped support in a sliding and sleeving mode, the relative position of the sliding block and the U-shaped support is locked through a locking bolt, and a clamping groove used for bearing a puncture needle is formed in the sliding block; the base at least comprises a side surface meeting the following conditions: when the U-shaped bracket is vertical to the base, the vertical distance from the central point of the lower bottom surface of the puncture through hole to the side surface is equal to the distance from the central point of the lower bottom surface of the puncture through hole to the projection point of the central point of the clamping groove on the lower bottom surface of the base; the central point of the lower bottom surface of the