Sample adding gun assembly for blood sampling tube

The utility model relates to the technical field of experimental instruments, and provides a sample adding gun assembly for a blood sampling tube, which comprises a gun head of a sample adding gun, a needle head is arranged at the tip of the gun head, and an elastic protective sleeve is arranged outside the needle head; two ends of the protective sleeve are hard contact ends, and the middle part of the protective sleeve is an elastic compression end; the elastic compression end comprises a plurality of elastic rings and a plurality of reinforcing rings, the elastic rings and the reinforcing rings are arranged in a stacked mode, and the elastic rings and the reinforcing rings are bonded. According to the sample adding gun assembly, the elastic protective sleeve is arranged outside the needle head, sampling or sample adding can be directly carried out without taking down the protective sleeve, and the needle head is prevented from being exposed and stabbing an operator or causing infection; the connecting sleev