Vacuum blood collection tube with high sealing performance

The utility model discloses a vacuum blood collection tube with high sealing performance. The vacuum blood collection tube comprises a tube body, a rubber plug and a protective cover, an annular limiting step is arranged on the inner wall, adjacent to the top end, of the pipe body, and external threads are arranged on the outer wall, adjacent to the top end, of the pipe body. The rubber plug comprises an upper portion and a lower portion and is plugged into the pipe body from top to bottom, an annular transition face between the upper portion and the lower portion of the rubber plug is in close contact with the annular limiting step in the pipe body, and the lower portion of the rubber plug is in close contact with the inner wall, below the annular limiting step, of the pipe body. The upper part of the rubber plug is tightly contacted with the inner wall above the annular limiting step of the pipe body; an internal thread is arranged on the inner wall of the protective cover, and the internal thread on the pr